Added basis for server-side cooldown checks, added warmup checks, closed #273

Note that cooldown check is currently used only for the holoemote
command. To add a cooldown to any command, all you have to do is
CreatureObject.addCooldown(name). In this commit I also moved some
cooldown variables from CombatCommand to BaseSWGCommand since many
non-combat commands had cooldowns (Wookie Roar, Holo-Emotes). I also put
in a warmup cooldown (time before command is called) for non-combat
commands.

src/services/BuffService.java

@@ -179,7 +179,7 @@ public class BuffService implements INetworkDispatch {
 					if (buffer == null)
 						removeBuffFromCreature(target, buff);
 
-					if (target.getPosition().getDistance2D(buffer.getWorldPosition()) > 80) {
+					if (target.getWorldPosition().getDistance2D(buffer.getWorldPosition()) > 80) {
 						removeBuffFromCreature(target, buff);
 					}
 				}