Really, this commit implements early J2K mapping for all Java types.
It's questionable and probably wrong at least for super-types,
because, for example, we cannot resolve spliterator() in classes
derived from java.lang.Iterable
Before this commit, we created type parameter symbols each time
when type parameter was referenced or created.
In this commit, we introduced class-bound Java type parameter stack
and use it to find referenced type parameter symbol.
So now they are created only when Java type parameter is created
Basically, this commit splits test data from the from java-txt-kt to two pairs java-txt and kt-txt.
This commit leads to some duplication in test data.
This is temporary: in the platform types branch the test data for LoadJava tests will be changed dramatically, so duplication will go away
