- renamed scanner and parser to Ros2Rag{Scanner,Parser}
- changed Compiler to not use System.exit throwing exceptions instead and have a dedicated run method
- implemented ASTNode.globallyResolveTokenComponentByToken and UpdateDefinition.resolveMappingByToken

- changed compiler to accept two additional required parameters "inputGrammar" and "inputRos2Rag"
- update ros2rag grammar according to latest draft
- begin with parser (missing resolving amongst others)
- parsing in test kind of fails because of leading comment