add carbon intensities for steel + cement

add variables needed in AR6 reporting for Cement and for Steel
bit of refactoring, before I realized I actually can put these variables to a different place and don't need this special weighting stuff here. But I checked that all existing variables remain identical.
results based on /p/tmp/oliverr/remind/output/default_2024-02-29_16.45.19/fulldata.gdx
   region variable                                                   `2010` `2020` `2030` `2040` `2050` `2060` `2070` `2080` `2090` `2100`
 1 CAZ    Carbon Intensity|Production|Cement                         0.800  0.763   0.732  0.696  0.653  0.618  0.589  0.556  0.530  0.522
 2 CHA    Carbon Intensity|Production|Cement                         0.660  0.532   0.524  0.515  0.512  0.508  0.511  0.520  0.522  0.532
 3 EUR    Carbon Intensity|Production|Cement                         0.754  0.739   0.719  0.679  0.661  0.639  0.602  0.575  0.550  0.538
 4 GLO    Carbon Intensity|Production|Cement                         0.673  0.592   0.587  0.572  0.555  0.556  0.543  0.531  0.516  0.511
 5 IND    Carbon Intensity|Production|Cement                         0.592  0.547   0.561  0.550  0.544  0.525  0.515  0.506  0.501  0.496
 6 JPN    Carbon Intensity|Production|Cement                         0.865  0.827   0.816  0.768  0.723  0.719  0.679  0.649  0.619  0.624
 7 LAM    Carbon Intensity|Production|Cement                         0.548  0.538   0.587  0.566  0.568  0.566  0.551  0.535  0.525  0.520
 8 MEA    Carbon Intensity|Production|Cement                         0.551  0.583   0.561  0.544  0.537  0.536  0.524  0.508  0.486  0.484
 9 NEU    Carbon Intensity|Production|Cement                         0.636  0.730   0.708  0.688  0.659  0.630  0.596  0.581  0.564  0.579
10 OAS    Carbon Intensity|Production|Cement                         0.805  0.798   0.772  0.710  0.636  0.654  0.611  0.586  0.561  0.544
11 REF    Carbon Intensity|Production|Cement                         0.933  0.785   0.735  0.708  0.692  0.668  0.639  0.610  0.599  0.588
12 SSA    Carbon Intensity|Production|Cement                         0.486  0.460   0.551  0.547  0.506  0.540  0.529  0.516  0.502  0.503
13 USA    Carbon Intensity|Production|Cement                         0.950  0.769   0.701  0.688  0.624  0.590  0.571  0.537  0.511  0.485
14 CAZ    Carbon Intensity|Production|Cement|+|Fossil|Energy|Demand  0.380  0.356   0.338  0.315  0.284  0.262  0.246  0.225  0.212  0.217
15 CHA    Carbon Intensity|Production|Cement|+|Fossil|Energy|Demand  0.355  0.226   0.219  0.210  0.207  0.203  0.206  0.215  0.217  0.226
16 EUR    Carbon Intensity|Production|Cement|+|Fossil|Energy|Demand  0.374  0.367   0.356  0.325  0.314  0.300  0.272  0.254  0.236  0.232
17 GLO    Carbon Intensity|Production|Cement|+|Fossil|Energy|Demand  0.322  0.249   0.244  0.231  0.215  0.219  0.212  0.207  0.201  0.206
18 IND    Carbon Intensity|Production|Cement|+|Fossil|Energy|Demand  0.222  0.184   0.205  0.202  0.203  0.191  0.188  0.187  0.189  0.190
19 JPN    Carbon Intensity|Production|Cement|+|Fossil|Energy|Demand  0.450  0.425   0.426  0.390  0.357  0.365  0.337  0.319  0.302  0.319
20 LAM    Carbon Intensity|Production|Cement|+|Fossil|Energy|Demand  0.183  0.179   0.235  0.221  0.230  0.234  0.226  0.216  0.213  0.215
21 MEA    Carbon Intensity|Production|Cement|+|Fossil|Energy|Demand  0.131  0.175   0.167  0.163  0.169  0.180  0.180  0.178  0.169  0.179
22 NEU    Carbon Intensity|Production|Cement|+|Fossil|Energy|Demand  0.216  0.324   0.314  0.307  0.290  0.274  0.253  0.250  0.246  0.273
23 OAS    Carbon Intensity|Production|Cement|+|Fossil|Energy|Demand  0.390  0.395   0.381  0.332  0.270  0.300  0.270  0.256  0.244  0.239
24 REF    Carbon Intensity|Production|Cement|+|Fossil|Energy|Demand  0.519  0.383   0.344  0.329  0.326  0.315  0.297  0.280  0.282  0.283
25 SSA    Carbon Intensity|Production|Cement|+|Fossil|Energy|Demand  0.0862 0.0709  0.172  0.179  0.148  0.193  0.192  0.190  0.187  0.198
26 USA    Carbon Intensity|Production|Cement|+|Fossil|Energy|Demand  0.525  0.357   0.302  0.303  0.252  0.232  0.226  0.206  0.192  0.179
27 CAZ    Carbon Intensity|Production|Cement|+|Industrial Processes  0.420  0.407   0.394  0.382  0.369  0.356  0.343  0.331  0.318  0.305
28 CHA    Carbon Intensity|Production|Cement|+|Industrial Processes  0.305  0.305   0.305  0.305  0.305  0.305  0.305  0.305  0.305  0.305
29 EUR    Carbon Intensity|Production|Cement|+|Industrial Processes  0.380  0.372   0.363  0.355  0.347  0.338  0.330  0.321  0.314  0.306
30 GLO    Carbon Intensity|Production|Cement|+|Industrial Processes  0.350  0.343   0.343  0.341  0.340  0.337  0.331  0.323  0.315  0.305
31 IND    Carbon Intensity|Production|Cement|+|Industrial Processes  0.370  0.363   0.355  0.348  0.341  0.334  0.327  0.320  0.312  0.305
32 JPN    Carbon Intensity|Production|Cement|+|Industrial Processes  0.415  0.403   0.390  0.378  0.366  0.354  0.342  0.330  0.317  0.305
33 LAM    Carbon Intensity|Production|Cement|+|Industrial Processes  0.365  0.358   0.352  0.345  0.338  0.332  0.325  0.318  0.312  0.305
34 MEA    Carbon Intensity|Production|Cement|+|Industrial Processes  0.420  0.407   0.394  0.381  0.369  0.356  0.343  0.331  0.318  0.305
35 NEU    Carbon Intensity|Production|Cement|+|Industrial Processes  0.420  0.407   0.394  0.382  0.369  0.356  0.343  0.331  0.318  0.305
36 OAS    Carbon Intensity|Production|Cement|+|Industrial Processes  0.415  0.403   0.390  0.378  0.366  0.354  0.342  0.329  0.317  0.305
37 REF    Carbon Intensity|Production|Cement|+|Industrial Processes  0.415  0.403   0.390  0.378  0.366  0.354  0.342  0.329  0.317  0.305
38 SSA    Carbon Intensity|Production|Cement|+|Industrial Processes  0.400  0.389   0.379  0.368  0.358  0.347  0.337  0.326  0.316  0.305
39 USA    Carbon Intensity|Production|Cement|+|Industrial Processes  0.425  0.412   0.398  0.385  0.372  0.358  0.345  0.332  0.319  0.305
40 CAZ    Carbon Intensity|Production|Steel|Fossil|Energy|Demand     0.801  0.740   0.599  0.480  0.432  0.417  0.417  0.468  0.450  0.391
41 CHA    Carbon Intensity|Production|Steel|Fossil|Energy|Demand     1.88   1.33    1.18   1.17   1.15   1.21   1.32   1.37   1.40   1.39
42 EUR    Carbon Intensity|Production|Steel|Fossil|Energy|Demand     0.718  0.660   0.584  0.606  0.560  0.549  0.608  0.629  0.687  0.662
43 GLO    Carbon Intensity|Production|Steel|Fossil|Energy|Demand     1.44   1.28    1.26   1.28   1.29   1.49   1.58   1.48   1.29   1.09
44 IND    Carbon Intensity|Production|Steel|Fossil|Energy|Demand     1.81   1.98    2.43   2.41   2.42   2.17   1.71   0.489  0.357  0.333
45 JPN    Carbon Intensity|Production|Steel|Fossil|Energy|Demand     1.43   1.40    1.32   1.42   1.49   1.62   1.75   1.87   1.99   2.14
46 LAM    Carbon Intensity|Production|Steel|Fossil|Energy|Demand     0.651  0.709   0.988  0.927  0.877  0.800  0.766  0.691  0.715  0.611
47 MEA    Carbon Intensity|Production|Steel|Fossil|Energy|Demand     0.579  0.927   0.642  0.501  0.503  0.546  0.531  0.489  0.270  0.184
48 NEU    Carbon Intensity|Production|Steel|Fossil|Energy|Demand     0.530  0.497   0.337  0.227  0.286  0.290  0.362  0.481  0.574  0.483
49 OAS    Carbon Intensity|Production|Steel|Fossil|Energy|Demand     0.913  1.50    1.44   1.30   1.27   2.09   2.03   1.81   1.48   1.11
50 REF    Carbon Intensity|Production|Steel|Fossil|Energy|Demand     2.20   2.59    2.69   2.70   2.74   2.74   2.67   2.58   2.61   2.46
51 SSA    Carbon Intensity|Production|Steel|Fossil|Energy|Demand     1.10   0.839   1.95   2.13   1.93   2.90   2.93   2.75   2.19   1.39
52 USA    Carbon Intensity|Production|Steel|Fossil|Energy|Demand     0.668  0.519   0.415  0.316  0.295  0.301  0.303  0.289  0.297  0.290
pik-piam / remind2

add carbon intensities for steel + cement #582
