WIP: Not really tested and contains RuntimeExceptions that I used for testing
WIP: Not all possible return types covered
WIP: Not really clear which order/priority some statement contents should be checked
WIP: Not dealing with type mismatches or one branch returning something a subclass of the other branch's return type

E.g. IIngredient has a method that accepts an IItemStack, which is a sub-interface

Fairly sure this is an eclipse issue, no problems are reported in idea...
https://bugs.eclipse.org/bugs/show_bug.cgi?id=474593

Threw an exception when an import member could not be found.
Also, the value was not used anywhere

TODO: Verify that the access check is correct

Functional interface wrappers should work now
Implementing a method with a signature differing from the actual one (e.g. when dealing with generics) now creates a proper bridge method
The Java Bytecde compiler used an incorrect method in checkCast
We now no longer use hardcoded 'accept's as method names but whatever the context tells us to.

Currently only supports 'accepts' methods, until we can get a way to get the actual method signature/name from the class