CAST 1.2 and GroMEt PR

[titomeister]

This pull request represents a large change to the AutoMATEs directory.

It contains:

• Modifications to the CAST structure to support LiteralValues in a different way.
• The first initial implementation of GroMEt V2. Includes newly generated files to support the structure, and import/export utilities.
• Modifications to Ryan and Janalee's AnnCAST passes to support GroMEt and additional language constructs (for loops, tuple assignment)
• Additional changes to the Python to CAST generation to support the CAST 1.2 and new language feature changes.

[codecov[bot]]

Codecov Report

Merging #312 (3606fc7) into master (36ee4f5) will decrease coverage by 34.40%. The diff coverage is 7.72%.

@@             Coverage Diff             @@
##           master     #312       +/-   ##
===========================================
- Coverage   66.88%   32.48%   -34.41%     
===========================================
  Files         106      148       +42     
  Lines       21729    25107     +3378     
===========================================
- Hits        14534     8155     -6379     
- Misses       7195    16952     +9757     

Impacted Files	Coverage Δ
...tomates/model_assembly/gromet/metadata/__init__.py	0.00% <0.00%> (ø)
...utomates/model_assembly/gromet/metadata/bibjson.py	0.00% <0.00%> (ø)
...el_assembly/gromet/metadata/code_file_reference.py	0.00% <0.00%> (ø)
...el_assembly/gromet/metadata/equation_definition.py	0.00% <0.00%> (ø)
...el_assembly/gromet/metadata/equation_extraction.py	0.00% <0.00%> (ø)
...del_assembly/gromet/metadata/equation_parameter.py	0.00% <0.00%> (ø)
.../model_assembly/gromet/metadata/gromet_creation.py	0.00% <0.00%> (ø)
...es/model_assembly/gromet/metadata/literal_value.py	0.00% <0.00%> (ø)
...tomates/model_assembly/gromet/metadata/metadata.py	0.00% <0.00%> (ø)
...mates/model_assembly/gromet/metadata/provenance.py	0.00% <0.00%> (ø)
... and 78 more

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