Collisions

Doesn't look like much, but bullet to ship collisions and applying of damage done. A hitpoint bar shows below the ships.

I'd like to get bullets to fly in a parabolic arc, like shells. So might try that.

Next I'll need to have a destroyed state for ships, ship to ship collisions, visual differences between enemy / player fleets, selected ship indicator, and picking enemy ships (at the moment we just shoot at a point in space)

So much to do - so little time!