Move Texture handling to new base class
Fix wrong centering of window
Remove regions
Fix MatrixUsage for rectReflection in OGL
Fix artifacts on NPOT textures in OGL
Fix reuse check of textures
Introduce Size field for textures (replacing W2, H2)
Speed up slideshow loading
Rename Unload to Close to match Init-Close pattern
Factor out CSkin class
Replace usages of GetColor and remove GetColor(..., skinIndex,...)
Introduce CVideoStream for easier video handling (already includes a texture, important for common usage of streams)