Update PopupSliderChoiceFloat to have increment/decrement buttons, and stepping.
Need to initialise step_ here, too.
Merge pull request #229 from thedax/sliderfloat-step

Update PopupSliderChoiceFloat to have increment/decrement buttons, and stepping.
Drop the thread from Qt audio loop. Makes exit cleaner.
Probably needs to be reworked or replaced with SDL it seems.
Update GLEW with GL4.4 support
Thin3D: A thin OpenGL/D3D9 wrapper for basic rendering.

Only the OpenGL implementation actually works yet.
Slip thin3d underneath DrawBuffer/UI
Crashfix
Fix vertex declarations. Hook up some more of D3D9 (doesn't work yet)
Thin3d: Add some untested texturing stuff
Switch to Thin3DTexture. GL still works, d3d still broken.
Thin3d: Add cull mode, other fixes
More Thin3D work (textures etc)
Some more thin3d
Thin3D now actually draws some stuff
Thin3D: Add APIName query. Swizzle texture colors in D3D.

(not sure whether it's best done in the shader or in the texture data...)
Add Thin3d support to draw_text (Qt not touched)
Thin3d: Minor shader cleanup
Fix Linux/Android compilation.
Fix some type conversion warnings.