Add support for monitoring pointing sticks

Using XSync syndaemon can watch for activity from a laptop's pointing
stick and change the settings accordingly. Useful for machines with a
pointing stick that relies on it's clickpad's software buttons.

By default, enabling point stick monitoring will also disable keyboard
monitoring so that the user doesn't have to have keyboard monitoring
enabled. However, keyboard monitoring can be enabled simultaneously by
specifying -M on the command line.

Signed-off-by: Stephen Chandler Paul <thatslyude@gmail.com>