Add bytecode-based deobfuscator #5

Remaining items:

Track original local variable names
Static scrambling transformer
Ignore access flags and calculate them ourselves (required for static scrambling to work)
~~Remove unused code (e.g. there are some leftover branches/variables - I think from a mixture of opaque predicates and the dummy transformer)~~ I think this is unused code from Jagex's codebase (with unused fields removed by their obfuscator?). There's a small amount of it, so I'm not going to bother removing it automatically.
~~Automatically rename string constants~~ I'm not going to bother with this, as some of the names would end up being quite long, there might be duplicates and it doesn't actually save much manual effort
Add @Override annotations
Improve FinalTransformer? Could/should we try to make more methods/fields final?

The original goals in this issue are complete, so I'll close it in favour of the separate issues with the deobfuscator label.