Improve context from python src

[JSAbrahams]

Relevant issues

• Closes #307
• Closes #298

Flagged some issues when generating Context from Python source:

• Made note of https://github.com/JSAbrahams/mamba/issues/314
• Made note of https://github.com/JSAbrahams/mamba/issues/315
• Made note of https://github.com/JSAbrahams/mamba/issues/316
• Made note of https://github.com/JSAbrahams/mamba/issues/317
• Made note of https://github.com/JSAbrahams/mamba/issues/318
• Made note of https://github.com/JSAbrahams/mamba/issues/319
• Made note of https://github.com/JSAbrahams/mamba/issues/320

Summary

A lot of the behaviour of the context has assumed to been correct. However, as we implement more advanced features, verifying the behaviour of the Context will save us some time. For instance, inferring expected behaviour from Python primitives and standard library from the built-in resources.

It might also help in future if we ever decide to do a major refactor. For instance, we may need to update our dependencies if it cannot parse properly the newest Python constructs.

• Don't include Python init in GenericClassDef
• When generating class from Python source, set in_class of Field to class name
• Class generics are also taken from Mamba classes
• Type definitions and aliases have self as argument
• self in a class has the class as type
• Fix #298 by marking a field as assigned to if it is assigned to directly in the definition

Added Tests

• Converting Python class to GenericClass.
• Converting Python function to GenericFunction.

[codecov[bot]]

Codecov Report

Merging #313 (7f9025d) into develop (a4a9f1d) will increase coverage by 0.82%. The diff coverage is 91.37%.

@@             Coverage Diff             @@
##           develop     #313      +/-   ##
===========================================
+ Coverage    86.30%   87.12%   +0.82%     
===========================================
  Files          105      105              
  Lines        10825    11313     +488     
===========================================
+ Hits          9342     9856     +514     
+ Misses        1483     1457      -26     

Impacted Files	Coverage Δ
src/check/context/arg/python.rs	100.00% <ø> (ø)
src/check/context/parameter/generic.rs	0.00% <ø> (ø)
src/check/context/parameter/python.rs	57.69% <ø> (ø)
src/check/context/parent/generic.rs	78.57% <ø> (-2.68%)	:arrow_down:
src/check/context/python.rs	71.05% <0.00%> (ø)
src/check/name/truename/generic.rs	62.96% <50.00%> (ø)
src/check/context/field/python.rs	48.78% <58.82%> (+10.94%)	:arrow_up:
src/check/context/clss/python.rs	86.82% <83.84%> (-2.97%)	:arrow_down:
src/check/context/function/generic.rs	92.07% <91.11%> (+3.36%)	:arrow_up:
src/check/context/function/python.rs	96.87% <94.73%> (-3.13%)	:arrow_down:
... and 21 more

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