Feat: Remove indent dedent

[JSAbrahams]

Summary

A clean slate of sorts after not working on this project for some time.
Intent is that we can do smaller iterative changes after we stabilise again, which should hopefully be in a few commits.

• Explicit code sets, with, and blocks as defined in README
• Update straggling docs
• Remove def in class arguments
• Add traits and differentiate from types
• A few bug fixes in the checker

Added Tests

• Test suite resources updated to reflect changes in grammar of language.

[codecov]

Codecov Report

❌ Patch coverage is 80.26906% with 88 lines in your changes missing coverage. Please review.
✅ Project coverage is 88.91%. Comparing base (b34594c) to head (320e09d).
⚠️ Report is 1 commits behind head on develop.

Files with missing lines	Patch %	Lines
src/generate/convert/class.rs	72.95%	43 Missing ⚠️
src/parse/lex/token.rs	56.36%	24 Missing ⚠️
src/parse/ast/node.rs	70.58%	5 Missing ⚠️
src/parse/control_flow_stmt.rs	83.33%	4 Missing ⚠️
src/parse/mod.rs	33.33%	4 Missing ⚠️
src/check/constrain/generate/class.rs	78.57%	3 Missing ⚠️
src/check/context/arg/generic.rs	50.00%	1 Missing ⚠️
src/check/context/field/generic.rs	91.66%	1 Missing ⚠️
src/check/name/mod.rs	0.00%	1 Missing ⚠️
src/parse/control_flow_expr.rs	92.85%	1 Missing ⚠️
... and 1 more

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #489      +/-   ##
===========================================
- Coverage    89.37%   88.91%   -0.47%     
===========================================
  Files          104      104              
  Lines        14770    15028     +258     
===========================================
+ Hits         13201    13362     +161     
- Misses        1569     1666      +97     

Files with missing lines	Coverage Δ
src/check/ast/mod.rs	100.00% <ø> (ø)
src/check/ast/node.rs	93.92% <100.00%> (-2.19%)	⬇️
src/check/constrain/generate/collection.rs	97.43% <100.00%> (ø)
src/check/constrain/generate/mod.rs	93.93% <100.00%> (ø)
src/check/constrain/unify/function.rs	84.58% <100.00%> (ø)
src/check/context/clss/generic.rs	92.85% <100.00%> (+0.08%)	⬆️
src/check/context/clss/mod.rs	96.66% <100.00%> (+0.45%)	⬆️
src/check/context/generic.rs	97.87% <ø> (ø)
src/generate/convert/control_flow.rs	94.84% <100.00%> (+0.14%)	⬆️
src/generate/convert/mod.rs	93.87% <100.00%> (ø)
... and 23 more

... and 5 files with indirect coverage changes

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