NativeWindow: Add accessor interfaces NativeSurfaceHolder and NativeWindowHolder

- NativeSurfaceHolder interface allows access to it's implementation's NativeSurface reference.
- NativeWindowHolder interface allows access to it's implementation's NativeWindow reference.

Implement or extend interface w/ these accessors whereever it seems fit:
  - NEWT Window
  - GLDrawable

These accessors allow lower layers to retrieve the NativeSurface/Window instance
w/o knowledge of the 'upper' frameworks, ie. NativeWindow/JOGL or JOGL/NEWT.

Commited in followups (due to mixed semantical changes in those files):
  - JAWTWindow
  - NewtCanvasAWT
  - Some NEWT impl.

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