Schema Extraction Preprocessor

[Anilm3]

This PR introduces preprocessors and generators, more specifically:

• Generic preprocessor and context / parser support
• Schema extraction generator

Note that many of the utils in test, tools and validator are currently duplicated but these will be refactored soon.

[codecov-commenter]

Codecov Report

Merging #182 (2e01180) into master (889b3b2) will increase coverage by 1.10%.
The diff coverage is 82.49%.

@@            Coverage Diff             @@
##           master     #182      +/-   ##
==========================================
+ Coverage   80.02%   81.13%   +1.10%     
==========================================
  Files          98      104       +6     
  Lines        3455     3726     +271     
  Branches     1564     1678     +114     
==========================================
+ Hits         2765     3023     +258     
+ Misses        305      291      -14     
- Partials      385      412      +27     

Flag	Coverage Δ
waf_test	81.13% <82.49%> (+1.10%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files Changed	Coverage Δ
src/context_allocator.hpp	73.91% <ø> (ø)
src/parameter.cpp	70.76% <ø> (+17.59%)	⬆️
src/parser/specification.hpp	100.00% <ø> (ø)
src/ruleset.hpp	44.00% <ø> (ø)
src/ruleset_builder.hpp	100.00% <ø> (ø)
src/ruleset_builder.cpp	80.00% <50.00%> (-2.54%)	⬇️
src/preprocessor.cpp	75.00% <75.00%> (ø)
src/parser/parser_v2.cpp	85.64% <78.94%> (-1.13%)	⬇️
src/context.cpp	82.88% <80.00%> (-0.99%)	⬇️
src/generator/extract_schema.cpp	81.02% <81.02%> (ø)
... and 11 more

... and 1 file with indirect coverage changes

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