Experimenting with mouse input

That's right, somebody wanted to use the mouse for targeting. The nerve. It is a pain to use the arrow keys to cursor around, but I planned to add shortcut keys so you can easily jump from target to target. Nonetheless I do aim to please so I checked in an initial version to CVS. It needs some polish but works about as expected. Mousephiles start your glad rejoicing. Anti-mousites please withold the flames, we will get our hotkeys so we can continue feeling smugly superior.