Bug 801: Cleanup shader-program location/data update ; Add COLORTEXTURE + TextureSequence to Region (Demo: TextureButton)

Cleanup shader-program location/data update

- GLUniformData:
  - Allow lazy data setup, as used for
    RenderState.ProgramLocal, see below

- RenderState
  - Separate data (pmv, weight, colorStatic) from
    program-local uniforms -> add class ProgramLocal.
    Reduces uniform location lookups, since
    ProgramLocal is bound to Region impl.

  - ProgramLocal.update(..) needs to write uniform data always,
    since data is being used in multiple programs!

  - No 'dirty' tracking possible, removed - see above.

- RegionRenderer
  - Fix shader-selection: 2-pass programs differ from 1-pass!
  - No shader-setup at init

+++

Add COLORTEXTURE + TextureSequence to Region
  - Create color-texture coords in vertex-shader via region's bounding box (pass-1)
  - Use color-texture unit in pass-1 if enabled (own shader program)
  - Use TextureSequence in Region impl. providing all required data (unit + texture-name)
  - Demo: TextureButton (a UIShape)