Support of the JavaCC C++ generated code

[zosrothko]

Hi John

This PR provides the support of the generation of JavaCC tool for the C++ target. There is a new script variable named 'language' defaulted to Language.Java. Thus all code & tests for the Java generation are identical to your latest master.

[codecov-io]

Codecov Report

Merging #40 into master will increase coverage by -8.23%.

@@             Coverage Diff             @@
##             master     #40      +/-   ##
===========================================
- Coverage     87.73%   79.5%   -8.23%     
- Complexity        0     152     +152     
===========================================
  Files            23      24       +1     
  Lines           432     488      +56     
  Branches         39      44       +5     
===========================================
+ Hits            379     388       +9     
- Misses           49      86      +37     
- Partials          4      14      +10

Impacted Files	Coverage Δ	Complexity Δ
...glinc/gradle/plugins/javacc/CompileJjtreeTask.java	23.52% <ø> (ø)	2 <ø> (+2)	✅
...glinc/gradle/plugins/javacc/CompileJavaccTask.java	23.52% <ø> (ø)	2 <ø> (+2)	✅
...oglinc/gradle/plugins/javacc/CompileJjdocTask.java	25% <ø> (ø)	2 <ø> (+2)	✅
...ns/javacc/compiler/NonJavaccSourceFileVisitor.java	78.94% <ø> (-21.06%)	5 <2> (+5)
...mpilationresults/CompiledJavaccFilesDirectory.java	100% <100%> (ø)	4 <1> (+4)	✅
...onresults/CompiledJavaccFilesDirectoryFactory.java	100% <100%> (ø)	9 <ø> (+9)	✅
...ava/ca/coglinc/gradle/plugins/javacc/Language.java	100% <100%> (ø)	1 <1> (?)
...linc/gradle/plugins/javacc/AbstractJavaccTask.java	61.53% <25%> (-6.65%)	6 <1> (+6)
...e/plugins/javacc/JavaToJavaccDependencyAction.java	57.14% <56.25%> (-42.86%)	13 <12> (+13)
.../javacc/compilationresults/CompiledJavaccFile.java	73.86% <73.86%> (-18.2%)	19 <19> (+19)
... and 2 more

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[zosrothko]

Hi John..; Would you mind to have a look at this PR.. I need it published for adding tests on JavaCC c++ generation. Thank in advance.