Move self transforms to compile time transformation

[Janrupf]

Whats going on?

A lot of the transformers transform classes in a way which could be done at compile time as well. This should reduce startup time and also time joining a server (and more cases, which are not known yet).

Proposed solution

Move transformation of classes to compile time when possible. This means for example add methods, changing visibility modifiers and generating factories at compile time.

Then they only need to be registered using the already existing mechanism.