Removed support for some unusual image formats

Weird, OVR_Version.h still points to 1.7, probably a typo...

raylib uses spaces between '+' and '-' signs but not between '*' and '/'
signs, it's a chosen convention

- LoadWave()
- LoadWaveEx()
- UnloadWave()
- WaveFormat()
- WaveCopy()
- WaveCrop()
- GetWaveData()

LoadOBJ can now load objects with having no texture coordinates or
objects having texture coordinates specified as tuples.

Generates:
Win32:  raylib.dll, libraylibdll.a (import library)
Linux:  libraylib.so

This fix allows GenMeshCubicmap() to create cubic maps having cells of
arbitrary sizes.

Fixed use-after-free in DestroyLight

Exposed Texture2D.id to Lua
Lights now have settable/gettable fields