Java porting of the g-truc GLI

Every format listed here is supported unless where differently specified here

Feel free to help/contribute

Steps:

• add jars under \lib

• dx: Fix ALPHAPIXELS flags being specified for formats without alpha channels.
• Improve 16 bits format coverage
• Improved assert coverage
• Fixed DXT1 sRGB enum
• documented alpha mode in header10
• Fixed handling of DDS DDPF_ALPHAPIXELS #68
• Gradle implemented
• Fixed Swizzles bug
• Added support for many new formats
• Added texture swizzle support #51
• Fixed PVRTC2
• Fixed BPTC enum names
• Added TARGET_RECT and TARGET_RECT_ARRAY texture target support
• Fixed DXGI_FORMAT_B8G8R8X8_UNORM_SRGB support #59
• Fixed FORMAT_RGBA8_UNORM DDS loading using DDPF_RGBA mode #60

• first true ported version
• added support for DDS and KTX texture formats