GROOVY-6673: Added reflective API to determine if a method is a trait method
GROOVY-6673: Make the API clearer that it is a bridge method and not the default implementation itself
GROOVY-6682: DOMCategory should not trim whitespace by default
Merge pull request #374 from melix/GROOVY-6673

Groovy 6673: Reflection API for Traits
GROOVY-6544: SourceAwareCustomizer should combine SourceUnit+ClassNode