Hom DSL

[neonWhiteout]

(@hom WeightModel l_type begin
  :stocks
  NormalWeight => pop
  OverWeight => pop
  Obese => pop

  :parameters
  μ => μ
  ~δ => δ
  rage => rage
  _ => rFstOrder

  :dynamic_variables
  v_NewBorn => v_birth
  ~Becoming => v_fstOrder
  ~Death => v_death
  _ => v_aging

  :flows
  f_NewBorn => f_birth
  ~Becoming => f_fstOrder
  ~Death => f_death
  ~id => f_aging
  _ => f_death

end) == typed_WeightModel

Note, this creates a homomorphism from WeightModel to (l_type with all attributes mapped to nothing).

[neonWhiteout]

It's going to say there's a lot of changes because I merged #93 into it

[neonWhiteout]

Thing is, this is literally just half of a \@stratify call. Need to figure out what I can pull out from both and use.

[neonWhiteout]

PLEASE NOTE THIS HAS #93 MERGED INTO IT!!! This will cause a lot of reformatting to occur throughout the project, to shorten lines and get tabs to be 2 spaces rather than 4.

[codecov[bot]]

Codecov Report

Attention: 284 lines in your changes are missing coverage. Please review.

Comparison is base (e82fa18) 50.03% compared to head (b224859) 52.03%. Report is 1 commits behind head on master.

Files	Patch %	Lines
src/StockFlow.jl	13.75%	138 Missing :warning:
src/SystemStructure.jl	58.97%	64 Missing :warning:
src/CausalLoop.jl	0.00%	40 Missing :warning:
src/Syntax.jl	93.37%	19 Missing :warning:
src/syntax/Stratification.jl	89.25%	13 Missing :warning:
src/syntax/Homomorphism.jl	92.30%	4 Missing :warning:
src/PremadeModels.jl	25.00%	3 Missing :warning:
src/syntax/Composition.jl	95.08%	3 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #101 +/- ## ========================================== + Coverage 50.03% 52.03% +2.00% ========================================== Files 9 10 +1 Lines 1525 1597 +72 ========================================== + Hits 763 831 +68 - Misses 762 766 +4 ```

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.

[neonWhiteout]

@Xiaoyan-Li