Various spellcasting fixes

Lars Mitsem Selbekkrequested to merge
i62-64/battle-spellcasting-fixes into master
  • Use passed caster-Hero for ActiveSpell-target
  • Remove parameterization on ActionData.CastSpell
  • Apply spells immediately on cast
  • Fix units not dying from spells
  • Improve battle finish detection
  • Flip converted units horizontally
  • Make converted units red

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