v0.9 Storm

Storm

• A rain spell with lots of low damage hits

Multi-hit issues

• Explosion now only hits once
• The hit detection is now caused by the spells calling on_hit on the actor they collided with
  • This let me do a lot of refactoring and centralize the damage taking logic into a separate component

New spells

• All the combinations with current spells and Storm
• Currently 42 spells are implemented

Other changes

• Some of the Wind combination spells are now clouds instead of explosions