Ability object

A Ability object must have the follow properties:

• Drain - Number - The total of ability power to drain
• MaxAbilityPower - Number - The max ability power to have
• DrainOnActivation - Boolean - Used to define if the ability will drain 'Drain' of ability power when activated
• UseAction - function(Player) - Function called when player uses his ability
• CanUseAbility - function() return Boolean - Function used to check if player can use ability