Graph Shader Simplification, 'a'/'b' redefined; GraphUI 2-pass demo;

Graph Shader Simplification

  - remove enable factor and 2nd 'discard' branch

  - use build-in 'max'/'clamp' functions, supposed to be faster

Graph Shader 'a'/'b' redefined

  - 'a' is 1-pass shader only

  - 'b' is 2-pass incl. (1st pass + 2nd pass)
    - Works well on ARM Mali-400 MP (Galaxy S2).
    - Doesn't work on NV tegra2 (P1202: Texture's gl states do not match with shader's),
      however 2-pass on mobile seems to be overkill for now.
      We may create a workaround (switch shader ..).

GraphUI 2-pass demo;
  - Propagate renderModes and texSize to UIShape's render(..)
  - TODO: Remove GL dependency in UIShape, maybe use a callback or visitor model
  - Adding GarpUI 2-pass launcher (Android and Standalone)

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