syntax role modifiers

[jurgenvinju]

This PR implements syntax role modifiers.

SyntaxModifiers.pdf

[codecov]

Codecov Report

Attention: Patch coverage is 28.73377% with 439 lines in your changes missing coverage. Please review.

Project coverage is 47%. Comparing base (71174c0) to head (c45eab9).

Files with missing lines	Patch %	Lines
src/org/rascalmpl/types/ModifySyntaxRole.java	23%	207 Missing and 28 partials ⚠️
src/org/rascalmpl/ast/SyntaxRoleModifier.java	20%	90 Missing and 1 partial ⚠️
src/org/rascalmpl/library/Type.java	33%	24 Missing ⚠️
src/org/rascalmpl/ast/Type.java	34%	20 Missing and 1 partial ⚠️
src/org/rascalmpl/types/RascalTypeFactory.java	43%	12 Missing and 1 partial ⚠️
...ascalmpl/semantics/dynamic/SyntaxRoleModifier.java	55%	12 Missing ⚠️
...org/rascalmpl/values/parsetrees/SymbolFactory.java	35%	10 Missing and 1 partial ⚠️
src/org/rascalmpl/ast/NullASTVisitor.java	0%	6 Missing ⚠️
src/org/rascalmpl/types/RascalType.java	0%	6 Missing ⚠️
src/org/rascalmpl/runtime/$RascalModule.java	0%	5 Missing ⚠️
... and 9 more

Additional details and impacted files

@@           Coverage Diff            @@
##              main   #1835    +/-   ##
========================================
- Coverage       47%     47%    -1%     
- Complexity    6342    6385    +43     
========================================
  Files          764     767     +3     
  Lines        63177   63808   +631     
  Branches      9431    9541   +110     
========================================
+ Hits         29945   30191   +246     
- Misses       31010   31373   +363     
- Partials      2222    2244    +22     

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