KTX support

[trexxet]

Title says it. Would be nice to have KTX format support for texture loading.

[slouken]

The design of the file format is specifically designed for easy import into OpenGL textures. We could add support for it, but you'd be bouncing through an intermediate format (SDL_Surface) which would negate that benefit, and you might as well use PNG or something else. Is there something I'm missing here?

[WolfEYc]

Say we didnt use SDL_Image to import KTX textures, what would we do instead, and how is that better then using SDL_Surface?

Ive actually found the opposite, with no real docs as to how to import KTX textures into usage with something like sdl.CreateGPUTexture