Create ability placeholders

[CorrieJ98]

Create the necessary framework for the ability system for units and buildings

[CorrieJ98]

Ability placeholders added inside Ability script. Profilenow reworked to seperate BuildingProfileand UnitProfileboth of which are inheriting (extending) from Ability.

Done

class_name Ability extends Resource

enum UnitBasicAbilities {GATHER,BUILD,}
enum UnitSpecialAbilities{INVISIBLITY, TRUESIGHT}
enum UnitTraits {HERO, WORKER, UNIQUE}

enum BuildingBasicAbilities {RALLYPOINT, }
enum BuildingSpecialAbilities {TRUESIGHT,ATTACK,SPAWNUNITS}
enum BuildingTraits {UNIQUE}