define GLEW_STATIC to avoid warning
using GL_EXT_framebuffer_objects instead of GL_ARB_framubuffer_objects.
Add warn log when falling back to xor texture
mix FBO_ARB and FBO_EXT code.
NativeMix now returns int
Buildfix
Cmakelist update
Buildfix for Mac/Linux/etc.

Although, Qt seems more involved...
add condition define for USING_GLES2
Merge pull request #58 from tpunix/fbo_ext

Fbo ext
Allow loading textures from a PNG in RAM. Add startsWith string function.
Add TouchCrossPad widget which actually can do diagonals reasonably.
Some drawing refactoring
Some drawing refactoring
Make generating mips optional for loaded-from-memory PNGs.
TouchCrossPad - don't break other input
Android: Don't preserve state of buttons not set through jni between frames.
Buttons don't have to clear state when not pressed after sticky fix.
Allow loading VFS resources from QRC (Qt assets inbuilt in to binary) if they exist