Charging the clockwork slab now uses overlays

code/game/gamemodes/clock_cult/clock_scriptures/scripture_cyborg.dm

@@ -9,7 +9,7 @@
 	channel_time = 30
 	primary_component = VANGUARD_COGWHEEL
 	quickbind_desc = "Allows you to grant a Servant and yourself stun immunity, as the Vanguard scripture.<br><b>Click your slab to disable.</b>"
-	slab_icon = "vanguard"
+	slab_overlay = "vanguard"
 	ranged_type = /obj/effect/proc_holder/slab/vanguard
 	ranged_message = "<span class='inathneq_small'><i>You charge the clockwork slab with defensive strength.</i>\n\
 	<b>Left-click a fellow Servant or yourself to grant Vanguard!\n\
@@ -38,7 +38,7 @@
 	channel_time = 30
 	primary_component = BELLIGERENT_EYE
 	quickbind_desc = "Allows you to place a Judicial Marker to knock down and damage non-Servants in an area.<br><b>Click your slab to disable.</b>"
-	slab_icon = "judicial"
+	slab_overlay = "judicial"
 	ranged_type = /obj/effect/proc_holder/slab/judicial
 	ranged_message = "<span class='neovgre_small'><i>You charge the clockwork slab with judicial force.</i>\n\
 	<b>Left-click a target to place a Judicial Marker!\n\

code/game/gamemodes/clock_cult/clock_scriptures/scripture_drivers.dm

@@ -90,7 +90,7 @@
 	sort_priority = 4
 	quickbind = TRUE
 	quickbind_desc = "Allows you to convert a Servant's brute, burn, and oxygen damage to half toxin damage.<br><b>Click your slab to disable.</b>"
-	slab_icon = "compromise"
+	slab_overlay = "compromise"
 	ranged_type = /obj/effect/proc_holder/slab/compromise
 	ranged_message = "<span class='inathneq_small'><i>You charge the clockwork slab with healing power.</i>\n\
 	<b>Left-click a fellow Servant or yourself to heal!\n\
@@ -111,7 +111,7 @@
 	sort_priority = 5
 	quickbind = TRUE
 	quickbind_desc = "Allows you to bind and start converting an adjacent target non-Servant.<br><b>Click your slab to disable.</b>"
-	slab_icon = "geis"
+	slab_overlay = "geis"
 	ranged_type = /obj/effect/proc_holder/slab/geis
 	ranged_message = "<span class='sevtug_small'><i>You charge the clockwork slab with divine energy.</i>\n\
 	<b>Left-click a target within melee range to convert!\n\

code/game/gamemodes/clock_cult/clock_scriptures/scripture_scripts.dm

@@ -386,7 +386,7 @@
 
 /datum/clockwork_scripture/ranged_ability/volt_ray
 	name = "Volt Ray"
-	slab_icon = "volt"
+	slab_overlay = "volt"
 	allow_mobility = FALSE
 	ranged_type = /obj/effect/proc_holder/slab/volt
 	ranged_message = "<span class='nzcrentr_small'><i>You charge the clockwork slab with shocking might.</i>\n\