Throwable zems

Allow special zems to be throwable for an effect. Range 3 tiles

• Ice zem: cast mass chill wind (with 50% chance of freezing)
• Fire zem: cast mass fire strike (with 50% chance of a single fire tick)
• Rebirth zem: cast resurrection (range 1 tile)
• Cancel zem: cast cancellation

PFM/AMP working as intended for each. Single use, disappear after.