Optimize QEventDispatcherWinRT::runOnMainThread()

- use std::make_shared instead of QSharedPointer
  - two memory allocations saved
- co-locate semaphore and HRESULT object in a single State object
  - one more memory allocation saved
- pass the shared_ptr<State> by value into the runnable
  - two more memory allocations saved

Not only is the new code much faster, it's also much more readable.

Also use QSemaphoreReleaser, just in case the delegate should throw.

Change-Id: Ib99b9da86984d440d10b72e3071aa88099e24a1f
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>

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