OSC message indicates user lifting finger off a key

Implement an OSC message from LW to App that indicates user lifting finger off a key.  In particular, it would be nice to have this on non-alphanumeric keys, but if you think it is easy to implement on all keys on the computer keyboard, go for it.

Example:
`/key/37/press`	(arrow left)
`/key/37/lift`

or better:
`/key/37 1`   (press)
`/key/37 0`   (lift)
