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* Added ability to stop event propagation on *Windows*. This will prevent
events from reaching other applications.
* Added ability to ignore events on *Windows*. This is a workaround for systems
where the keyboard monitor interferes with normal keyboard events.
* Added ability to modify events on *OSX*. This allows intercepting and
altering input events before they reach other applications.
* Corrected crash on *OSX* when some types of third party input sources are
installed.