Begun work on spells and abilities
Merge branch 'master' of https://github.com/jannickj/cruel-nemesis

Conflicts:
	UnityTestGame/Assets/GameLogic/Cards.meta
	UnityTestGame/Assets/GameLogic/Cards/SummonGruntCard.cs.meta
	UnityTestGame/Assets/GameLogic/Events/AbilityResolvesEvent.cs.meta
	UnityTestGame/Assets/GameLogic/Events/AbilityTargetInvalidEvent.cs.meta
	UnityTestGame/Assets/GameLogic/Events/RemovedFromGameEvent.cs.meta
	UnityTestGame/Assets/GameLogic/SpellSystem.meta
	UnityTestGame/Assets/GameLogic/SpellSystem/Ability.cs.meta
	UnityTestGame/Assets/GameLogic/SpellSystem/GameCard.cs.meta
	UnityTestGame/Assets/GameLogic/SpellSystem/Spell.cs.meta