LWJGL 3 - Vulkan support

[spasi]

The latest nightly build (3.0.0 #24) includes Vulkan bindings. Notes:

- There's virtually no documentation, only way I could get it out so soon.
- There's no real bootstrapping or a "capabilities" class. I'll work on it when I have time for a proper reading of the spec. Currently all functions are blindly loaded from the ICD, let me know if there are any issues with that.
- I'm currently porting this test from the GLFW repo. Demo contributions are welcome (single-file only please).

Enjoy!