Make JvmFunctionImplTypes lazy

It shouldn't compute all FunctionImpls at least until first asked
Remove GenerationStateAware
(TODO: ?) Use module instead of KotlinBuiltIns in ReflectionTypes
Introduce module 'reflection', move KFunctionN to it

Metadata for KFunction classes is now longer serialized along with built-in
classes. This effectively means that it's no longer possible to find KFunction
classes via dependency on built-ins. There should be a kotlin-runtime library
in the specified classpath for reflection types to be resolvable.

A lot of tests were moved and changed, because tests on callable references
require stdlib in classpath from now on
Move KFunctionN classes to package "kotlin.reflect"