Add support for named external block

[NiiRoZz]

Fix #50

[codecov]

Codecov Report

Attention: Patch coverage is 91.07143% with 5 lines in your changes missing coverage. Please review.

Project coverage is 76.60%. Comparing base (8bb3e0b) to head (0d82261).
Report is 2 commits behind head on named_external.

Files with missing lines	Patch %	Lines
src/NZSL/Ast/SanitizeVisitor.cpp	87.50%	3 Missing ⚠️
include/NZSL/Ast/Compare.inl	50.00%	2 Missing ⚠️

Additional details and impacted files

@@                Coverage Diff                 @@
##           named_external      #51      +/-   ##
==================================================
+ Coverage           76.57%   76.60%   +0.03%     
==================================================
  Files                 158      158              
  Lines               21044    21090      +46     
  Branches             6206     6455     +249     
==================================================
+ Hits                16115    16157      +42     
- Misses               4834     4844      +10     
+ Partials               95       89       -6     

Files with missing lines	Coverage Δ
include/NZSL/Ast/Nodes.hpp	45.45% <ø> (ø)
include/NZSL/Ast/SanitizeVisitor.hpp	100.00% <ø> (ø)
src/NZSL/Ast/Cloner.cpp	88.42% <100.00%> (+0.04%)	⬆️
src/NZSL/Ast/ReflectVisitor.cpp	93.06% <100.00%> (ø)
src/NZSL/GlslWriter.cpp	85.13% <100.00%> (ø)
src/NZSL/LangWriter.cpp	89.86% <100.00%> (+0.05%)	⬆️
src/NZSL/Parser.cpp	88.99% <100.00%> (+0.01%)	⬆️
src/NZSL/SpirvWriter.cpp	85.64% <100.00%> (ø)
tests/src/Tests/ErrorsTests.cpp	100.00% <ø> (ø)
tests/src/Tests/ExternalTests.cpp	100.00% <100.00%> (ø)
... and 2 more

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[NiiRoZz]

I'm not really a fan of this one, and I'm not really sure how to tackle it correctly

[SirLynix]

Thank you!