Adds chemical meter on HUD.

code/modules/mob/living/carbon/human/life.dm

@@ -1447,6 +1447,12 @@
 /mob/living/carbon/human/proc/handle_changeling()
 	if(mind && mind.changeling)
 		mind.changeling.regenerate()
+		if(hud_used)
+			ling_chem_display.invisibility = 0
+			ling_chem_display.maptext = "<div align='center' valign='middle' style='position:relative; top:0px; left:6px'><font color='#dd66dd'>[round(mind.changeling.chem_charges)]</font></div>"
+	else
+		if(mind && hud_used)
+			ling_chem_display.invisibility = 101
 
 /mob/living/carbon/human/handle_shock()
 	..()

code/modules/mob/mob_defines.dm

@@ -33,6 +33,7 @@
 	var/obj/screen/gun/move/gun_move_icon = null
 	var/obj/screen/gun/run/gun_run_icon = null
 	var/obj/screen/gun/mode/gun_setting_icon = null
+	var/obj/screen/ling/chems/ling_chem_display = null
 
 	//spells hud icons - this interacts with add_spell and remove_spell
 	var/list/obj/screen/movable/spell_master/spell_masters = null