Add castle damaging & phase transitions & Finished phase (closes #32)

Assets/Scripts/Logic/Command/AdvancePhaseCommand.cs

Assets/Scripts/Logic/Command/AdvancePhaseCommand.cs.meta

Assets/Scripts/Logic/Command/AdvanceTimeCommand.cs

Assets/Scripts/Logic/Data/GameOverview.cs

Assets/Scripts/Logic/Data/GamePhase.cs

Assets/Scripts/Logic/Data/World/Barrack.cs

Assets/Scripts/Logic/Data/World/Castle.cs

Assets/Scripts/Logic/Data/World/GameWorld.cs

Assets/Scripts/Logic/Data/World/Tower.cs

Assets/Scripts/Logic/Data/World/Unit.cs

Assets/Scripts/Logic/Event/PhaseAdvancedEvent.cs

Assets/Scripts/Logic/Event/PhaseAdvancedEvent.cs.meta

Assets/Scripts/Logic/Event/World/Castle.meta

...ts/Scripts/Logic/Event/World/Castle/CastleDamagedEvent.cs

...ripts/Logic/Event/World/Castle/CastleDamagedEvent.cs.meta

.../Scripts/Logic/Event/World/Castle/CastleDestroyedEvent.cs

...pts/Logic/Event/World/Castle/CastleDestroyedEvent.cs.meta

Assets/Scripts/Logic/Event/World/Castle/ICastleEvent.cs

Assets/Scripts/Logic/Event/World/Castle/ICastleEvent.cs.meta

Assets/Scripts/Logic/Event/World/Unit/UnitDestroyedEvent.cs