New primitive engine, bugfixes: take 3

- new primitive emulation engine based on BoxesRunTime - no more hardcoded methods
- fix bug causing module to be reinitialized when usage goes in and out of scope - module in heap looked up by its symbol instead of by value
- add primitive and exception tests
`scala.reflect.runtime.universe.classSymbol(any.getClass.getField("TYPE").get(null).asInstanceOf[Class[_]]).toType`