Bug 1213 (related): Fix TaskBase, RunnableTask and FunctionTask implementation and semantics

- TaskBase
  - requires 'volatile boolean isExecuted' for atomic query of same semantics
  - fix isInQueue(): condition was reverse in regars to 'isExecuted'
  - expose 'Thread getExecutionThread()' as learned within run() method.

- RunnableTask
  - deprecate: 'static invoke(final boolean waitUntilDone, final Runnable runnable)',
    since it's nonsense, use runnable.run() instead.

  - 'static RunnableTask invokeOnNewThread(..)'
    - uses InterruptSource.Thread
    - Persistent-Wait
    - Cancelable using InterruptedRuntimeException

- FunctionTask
  - deprecate 'static <U,V> U invoke(final boolean waitUntilDone, final Function<U,V> func, final V... args)',
    since it's nonsense, use func.eval(args) instead.

  - 'static FunctionTask<U,V> invokeOnNewThread(..)'
    - uses InterruptSource.Thread
    - Persistent-Wait
    - Cancelable using InterruptedRuntimeException

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