Implemented ktxLoadTextureM. Fixed the following:
- Public Bugzilla 571: crash when null passed for pIsMipmapped.
- Public Bugzilla 572: memory leak when unpacking ETC textures.
- Public Bugzilla 573: potential crash when unpacking ETC textures with unused padding pixels.
- Public Bugzilla 576: various small fixes.
Thanks to Krystian Bigaj for the ktxLoadTextureM implementation and these fixes.
Initial release.