adds domain expansion

- adds domain expansion, final spell for void heretics
- makes clap1 into an emote
- makes cleave a little more enticing with two guaranteed critical wounds and brute damage
- buffs void mark

code/modules/movespeed/modifiers/status_effects.dm

@@ -21,6 +21,9 @@
 	multiplicative_slowdown = 1.5
 	priority = 50
 
+/datum/movespeed_modifier/status_effect/domain
+	multiplicative_slowdown = 1.5
+
 /datum/movespeed_modifier/status_effect/tased/no_combat_mode
 	multiplicative_slowdown = 8
 	priority = 100