- Removed DXGI_1_2_FORMATS and USE_XNAMATH control defines
- Deleted *Desktop_2010_SDK81.* project files, updated *Desktop_2010.* project files to use Windows 8.1 SDK
- Added helper to see if a texure's alpha channel is all opaque
- Reads and writes DXT2 and DXT4 DDS files
- Updated PremultiplyAlpha function to set miscFlags2 appropriately
- Texconv updated for new feature, "-dx10" switch now allows write of miscFlags2 data