Pynput

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* Reverted changes in *1.3.3*.
* Corrected platform specifier for *Python 2* on *Linux*.

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* Corrected bounds check for values on *Xorg*.

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* Made platform dependencies non-optional.

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* Corrected regression from previous release where button clicks would
crash the *Mac* mouse listener.

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* Fall back on `Button.unknown` for unknown mouse buttons in *Xorg* mouse
listener.

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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.