command: new property: mouse-pos

This is a read-only MPV_NODE value with integer fields: x, y.
The values are unmodified from mp_input_get_mouse_pos(...).

Observer notification of this property is tied to the INPUT_PROCESSED
event, which fires after mouse move even if no command is bound
(dummy commands are generated if nothing is bound to ensure that
mp_input_get_mouse_pos returns the latest values - see ac927e39 ).

This allows clients such as JSON IPC to observe mouse position even
while the OSC is enabled - the OSC force-binds mouse move for most
of the window area, making it impossible for other clients to bind
mouse move without breaking the OSC.

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