metamodel: more boxing supported for parameters, refactored in MethodHandleUtil class #226
metamodel: preliminary support for invocations with > 3 parameters #226
build: enable debug info in compiled language car

We should really add an option to ceylon compile
metamodel: use real method name for looking them up in reflection #226
metamodel: refactored boxing of return value into MethodHandleUtil and use for AppliedFunction invocation #226