Check in tools for generating generated_* files

[GoogleCodeExporter]

There's a lot of data files that get generated, such as 
cld_generated_cjk_uni_prop_80.cc and its ilk. There have been several problems 
in the past with the generated files that have necessitated post-generation 
fixes, e.g.:

https://code.google.com/p/cld2/source/detail?r=155
https://code.google.com/p/cld2/source/detail?r=156
https://code.google.com/p/cld2/source/detail?r=189
https://code.google.com/p/cld2/source/detail?r=192
https://code.google.com/p/cld2/source/detail?r=193

...

And now we have issue 32, which is more of the same. We don't have the 
templates or whatever are used to generated these source files checked in; we 
should. I get that the actual data is huge and isn't something we'd store in 
Git, but I'd really like to see us put the templates/generators into the code 
base so that we can maintain them alongside the code that they produce.

High priority because I feel that at this point there is likely drift between 
the templates and the code they produce; we should probably get the templates 
checked in and iterate on them until they produce exactly the same files that 
we have today, then proceed forward with maintenance.

WDYT?

Original issue reported on code.google.com by andrewha...@google.com on 1 May 2015 at 8:34

[GoogleCodeExporter]

Oh, right. I didn't notice (despite it having generated in the name!) that 
cld_generated_cjk_uni_prop_80.cc was generated. Let me know if I can help with 
making/testing a patch to get issue 32 fixed.

Original comment by scottmg@chromium.org on 1 May 2015 at 6:17