Mouse-Over Tooltips

On magic...

I've been doing some thinking, and I think that I'll start work on implementing magic for the next version. To speed this up, I think I'll make the control system for casting spells to be mouse-based for now, so that we have:

• left-mouse button: fire ranged weapon (the current behaviour)
  
• right-mouse button: fire current spell

If the spell doesn't have a target (e.g. if its a self-buff), then there is no need to click on the player symbol.

In a later version, I can then implement the full blown keyboard/targeting HUD control malarkey.