Start to write ASM utilities

All opcodes are generated by hand right now.

Make use of ASM (thin) wrappers and write wrappers of our own. Start with a
class helper which can generate method invocations.
ClassHelper: add argument checker to method invocation
ClassHelper: rewrite method find logic

You can have several methods with the same name but different arguments and
return types...
ClassHelper: more MethodInsnNode helpers
ClassHelper: minor code change
RuleMethod: make "localVariables" list final
Some minor code changes...
New class MethodDescriptor

One has to wonder why ASM does not include that :/
Deprecate one method of AsmUtil

AsmHelper takes care of that now.
ActionClassGenerator: use MethodDescriptor

That is one use though not the one I have envisioned at first...
One more use of MethodDescriptor...

Not quite there yet, are we?

Ahwell, at least, the code is more readable this way.
ASM 5.0.2
One more usage of a defined class...

Still VERY far from there though.