move classBuilderMode to injector and GenerationState from ClassBuilder

for type safety, to easier distinguish between:

* short names
* qualified names
* jvm names (slash-separated)
* special names like <root>
* null values that mean "undefined" and "root ns" in different contexts

All tests pass. Some beautifying needed

#KT-1477 Fixed

* do not fail on errors
* do not analyze function bodies
* generate "throw new RuntimeException()" in bytecode

hide inherited Object and jet.JetObject methods, and special static methods

(intermediate version)

Wrap ASM class generation so we can attribute generated classes with PSI origins when building kotlin-as-seen-from-java model