* Add list of included headers into the manifest
* Implement importing "foreign" type declarations
* Implement forward declarations more natively in the compiler
* Represent Objective-C categories as Kotlin extension methods and
properties
Also:
* Do some refactoring in stub generation
* Call bridges directly in stubs for Objective-C properties
Collected clang args in ClangArgs.kt
Switched dependencies/build.gradle to KonanTarget.
Introduced KonanProperties to take care of target specific properties.
Svyatoslav Scherbina