Add language::parser::Environment abstract class
Add language::parser::BasicEnvironment abstract class
Add Parser abstract class
Add Predicate type alias
Add LineContinuationTreatment enum class
Add Skipper class
Add WordComponentParser abstract class
Add RawStringParser class
Add WordParserImpl template class
Add WordParser class
fixup! Add Skipper class
Define operator<< on SourceBuffer::ConstIterator
WIP: Add CommentSkipper class