NEWT: Changed Lifecycle of Display/Screen (part 3)

- Fix DefaultEDTUtil deadlocks: Minimize locking!
    - invoke:
        - Check isCurrentThreadEDT() before locking edtLock
        - Check isRunning() redundant, since we start it beforehand

    - EventDispatchThread.run():
        - Relax definition of EDTUtil::waitUntilIdle(), ie method
          may return while last task is being executed (see below).
        - Execute task outside of edtTasks lock.

TODO: Fix more test cases (new and old)

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