Desugar default constructor and parents arguments

[JSAbrahams]

Relevant issues

Fixes #105 Fixes #53 Addresses #19

Summary

• Move assignment outside try except for handle statements following an assign.
• Preserve type definitions, these become classes with empty methods in Python, which is the Python equivalent of an interface.
• Fix #53 by only parsing a single expression for postfix calls

• 19 is somewhat addressed by making property accesses with nothing following them property access. If we add brackets (with or without arguments), these do become functions. So the syntax behaves the same was as in Python.

  The intent was to someday allow users to call functions without brackets if these don't take arguments. So if we opt to still include this feature it will probably be included in V0.2

Added Tests

[codecov[bot]]

Codecov Report

Merging #117 into master will increase coverage by 1.39%. The diff coverage is 73.21%.

@@            Coverage Diff             @@
##           master     #117      +/-   ##
==========================================
+ Coverage   83.42%   84.82%   +1.39%     
==========================================
  Files          70       68       -2     
  Lines        4755     4824      +69     
==========================================
+ Hits         3967     4092     +125     
+ Misses        788      732      -56

Impacted Files	Coverage Δ
tests/desugar/types.rs	94.11% <ø> (-1.13%)	:arrow_down:
tests/desugar/expression_and_statements.rs	89.85% <ø> (-0.82%)	:arrow_down:
tests/output/function.rs	92.3% <ø> (+30.76%)	:arrow_up:
src/desugar/mod.rs	100% <ø> (ø)	:arrow_up:
src/lexer/mod.rs	97.09% <ø> (ø)	:arrow_up:
src/parser/ast.rs	28.65% <0%> (+0.35%)	:arrow_up:
src/parser/call.rs	86.66% <100%> (+2.24%)	:arrow_up:
src/parser/_type.rs	95.03% <100%> (+2.12%)	:arrow_up:
tests/parser/valid/expression_and_statement.rs	85.46% <100%> (ø)	:arrow_up:
src/parser/operation.rs	97.58% <100%> (+0.01%)	:arrow_up:
... and 19 more

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[JSAbrahams]

Probably best to only merge this after #123 so we can verify the output.