GraphUI Demos: Bring back GPUUISceneGLListener0A ..

- Contrary to UISceneDemo0[01], here we
  - Call the Scene GLEventListener methods manually
  - Issue glClear* ourselves

- Using own PMVMatrixSetup
  - gluPerspective like Scene's default
  - no normal scale to 1, keep distance to near plane for rotation effects. We scale Shapes
  - translate origin to bottom-left

- Scale Button not by screen-size but Scene.getBounds() dimension,
  hence issue setupUI() from reshape() and not from init()

- GLButton: Using additional view-rotation like UISceneDemo01

- Multi-line text labels resize issues are
  - Supposed sticky-edge is moving
    (Sticky-edge are the opposites of the picked drag point)

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