Lifesteal

This update changes the identifiers for data relating to how much hitpoints are taken/given to a player. That means that updating to this version will remove any progress a player may have achieved in their hearts. If you plan to update to this version, make sure to keep note of everyone's hit points before updating, so you can restore everyone's progress.

• setHitPoint/getHitPoint command can now be used on groups of people
• Renamed everything "Heart" related to "Crystal" except "Heart Crystal"
• Reviveplayer command now shows dead spectating players
• Added an auto-revive timer (many internal changes were made to make this happen :<)