v0.5.1 (Hotfix)

A few fixes that came up since launch:

• Game properly gives you a defeat when your last girl goes down, instead of crashing
• A magical girl at 0 HP get tinted to show she's downed. Heal her before her turn comes up to get her back in the fight!
• Hovering over any unit's portrait in the turn order will highlight that unit on the field
• Some tentative improvements to the stability of large units