Merge branch 'feature/jastadd-extension'

.gitignore

build.gradle

src/main/jastadd/RelAst.relast

src/main/jastadd/backend/AbstractGrammar.jadd

src/main/jastadd/parser/RelAst.parser

src/main/jastadd/scanner/Header.flex

src/main/jastadd/scanner/Keywords.flex

src/main/jastadd/scanner/Macros.flex

src/main/jastadd/scanner/RulesPostamble.flex

src/main/jastadd/scanner/RulesPreamble.flex

src/main/jastadd/scanner/Symbols.flex

src/main/java/org/jastadd/JastAddConfiguration.java

...in/java/org/jastadd/relast/compiler/AbstractCompiler.java

src/main/java/org/jastadd/relast/compiler/Compiler.java

...n/java/org/jastadd/relast/compiler/CompilerException.java

...jastadd/relast/compiler/RelastSourceToSourceCompiler.java

src/test/java/org/jastadd/ros2rag/tests/RelAstTest.java