Obsolete the PROXMOVE flag and uses

code/modules/mob/living/carbon/human/species/xenomorphs/alien_facehugger.dm

@@ -15,7 +15,6 @@ var/const/MAX_ACTIVE_TIME = 400
 	icon_state = "facehugger"
 	item_state = "facehugger"
 	w_class = 3 //note: can be picked up by aliens unlike most other items of w_class below 4
-	flags = PROXMOVE
 	body_parts_covered = FACE|EYES
 	throw_range = 5
 

code/modules/mob/mob_defines.dm

@@ -3,7 +3,6 @@
 	layer = MOB_LAYER
 	plane = MOB_PLANE
 	animate_movement = 2
-	flags = PROXMOVE
 	var/datum/mind/mind
 
 	var/stat = 0 //Whether a mob is alive or dead. TODO: Move this to living - Nodrak