GBitmap Changes:
Added all other formats to gbitmap that we support
gbitmap now supports cubemaps
added converters for all these other formats
added stb_image_resize for extrudemips so we can extrude mipmaps for all other formats
GFXTextureManager
Can now directly make cubemaps and texture arrays based on the GFXTextureProfile
API implementations for all functions that cubemaps and arrays needed
it's getting there, but there have been a few spots noted where it eroneously corrupts text, so we'll have to pull this back out for a bit barring a proper resolution
Generating image previews of image assets was failing
DDS remove redundant check for stream status.
STB requires the file to be free before being written to, move check to make sure we can open the path into gBitmap and remove FileStream checks from everywhere else.
