Visitor
Forgot to commit/push lameness aside, it already implemented things like constructors and method/field containment on my end. Sorry about the double work you guys did because of that D:

Other changes made:
Rewrote to utilize the visitor properly.
Implemented Ferry's opcode changes (last 2 commits Ferry).
Removed own (not properly working) methodOverrides code and used Maria's rascal code.
Merge branch 'master' of https://github.com/FerryRiet/Rascal-clone

Conflicts:
	src/org/rascalmpl/library/lang/java/m3/internal/JarConverter.java