New two-phase language parser

[WheretIB]

Rewritten compiler from scratch using a two-phase parser & analyzer approach.

• improved syntax and expression trees
• parse error recovery with multiple error reports
• partial analyzer error recovery
• extended constant evaluation
• additional SSA intermediate representation with optimization passes
• improved source location tracking
• fixed translation to C++
• various compiler fixes
• VS Code extension with language server and debugger

[codecov[bot]]

Codecov Report

Merging #22 into master will decrease coverage by 12.08%. The diff coverage is 86.75%.

@@             Coverage Diff             @@
##           master      #22       +/-   ##
===========================================
- Coverage   93.04%   80.95%   -12.09%     
===========================================
  Files          35      129       +94     
  Lines       13542    31649    +18107     
  Branches        8        0        -8     
===========================================
+ Hits        12600    25622    +13022     
- Misses        941     6027     +5086     
+ Partials        1        0        -1

Impacted Files	Coverage Δ
TestRun.cpp	93.33% <ø> (-6.67%)	:arrow_down:
NULLC/includes/math.cpp	59.82% <ø> (ø)
NULLC/StrAlgo.cpp	100% <ø> (ø)	:arrow_up:
tests/TestOverride.cpp	100% <ø> (ø)
NULLC/TypeTree.h	86.52% <ø> (ø)
NULLC/Lexer.h	100% <ø> (ø)	:arrow_up:
NULLC/TypeTree.cpp	97.21% <ø> (ø)
tests/TestInterface.cpp	70.26% <ø> (ø)
tests/TestFinalizer.cpp	100% <ø> (ø)
tests/TestLValue.cpp	100% <ø> (ø)
... and 223 more

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