NEWT/OSX: Fix Memory Leak ; Fix Occasional Crash Duer to Lifecycle Ops not on Main-Thread.

- Fix Memory Leak
  - NewtWindow::dealloc -> [NewtView release]: Fixes NewtView leak
  - NewtView::dealloc -> removeTrackingRect: Removes occasional crash (double free of TrackingRect)

- Fix Occasional Crash Duer to Lifecycle Ops not on Main-Thread.
  Perform OSX WindowDriver ops on Main-Thread:
    - close0
    - changeContentView0
    - createWindow0

- Cleaned up AddRemove unit tests, added TestAddRemove03GLWindowNEWT
build-test.xml: Move 'junit.run.newt.awt' up in file; 'junit.run.newt': Exclude *AWT* and *SWT* (similar to 'junit.run.newt.headless')