Fix Bug 753: Stuttering caused by lack of GL resource synchronization between Java GL- and CALayer thread ; Simplify / Fix waitUntilRenderSignal().

Stuttering caused by lack of GL resource synchronization between Java GL- and CALayer thread
+ // Required(?) to finish previous GL rendering to give CALayer proper result,
+ // i.e. synchronize both threads each w/ their GLContext sharing same resources.
+ //
+ // FIXME: IMHO this synchronization should be implicitly performed via 'CGL.flushBuffer(contextHandle)' above,
+ // in case this will be determined a driver bug - use a QUIRK entry in GLRendererQuirks!
+ gl.glFinish();

Simplify / Fix waitUntilRenderSignal()
- remove loop and 'ready' condition -> nonsense
- if too later, i.e. lastWaitTime+TO < now, use now+TO as max. vsync waiting time

Bug735 Tests:
  - Make vsync, wait and ECT (exclusive context thread) configurable via main args.
  - Inv2*, Inv3* and Inv4*: Fluent Animation
  - Works w/ ECT

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