Bug fixes

• Semantics of companion object initialization fixed, INSTANCE field deprecated for companion objects
• Use-site targets fixed for @JvmName
• Exposing Java package-private types through internal declarations is allowed
• Access to Enum.values from within enums fixed
• Issues with Android 4 and DefaultImpls classes fixed
• Method count optimized for delegated properties on Android
• Two main() functions can't appear in the same file