Bools and returns super-pr (#53221) (#565)

Replaces like 70-80% of 0 and such, as a side effect cleaned up a bunch of returns
Edit: Most left out ones are in mecha which should be done in mecha refactor already
Oh my look how clean it is

Co-authored-by: TiviPlus <TiviPlus>
Co-authored-by: Couls <coul422@gmail.com>

Co-authored-by: TiviPlus <57223640+TiviPlus@users.noreply.github.com>
Co-authored-by: Couls <coul422@gmail.com>

code/modules/surgery/cavity_implant.dm

@@ -36,7 +36,7 @@
 	if(tool)
 		if(IC || tool.w_class > WEIGHT_CLASS_NORMAL || HAS_TRAIT(tool, TRAIT_NODROP) || istype(tool, /obj/item/organ))
 			to_chat(user, "<span class='warning'>You can't seem to fit [tool] in [target]'s [target_zone]!</span>")
-			return 0
+			return FALSE
 		else
 			display_results(user, target, "<span class='notice'>You stuff [tool] into [target]'s [target_zone].</span>",
 				"<span class='notice'>[user] stuffs [tool] into [target]'s [target_zone]!</span>",
@@ -54,4 +54,4 @@
 			return ..()
 		else
 			to_chat(user, "<span class='warning'>You don't find anything in [target]'s [target_zone].</span>")
-			return 0
+			return FALSE

code/modules/surgery/organ_manipulation.dm

@@ -153,4 +153,4 @@
 			display_results(user, target, "<span class='warning'>You can't extract anything from [target]'s [parse_zone(target_zone)]!</span>",
 				"<span class='notice'>[user] can't seem to extract anything from [target]'s [parse_zone(target_zone)]!</span>",
 				"<span class='notice'>[user] can't seem to extract anything from [target]'s [parse_zone(target_zone)]!</span>")
-	return 0
+	return FALSE

code/modules/surgery/organs/augments_chest.dm

@@ -149,7 +149,7 @@
 		if((organ_flags & ORGAN_FAILING))
 			if(!silent)
 				to_chat(owner, "<span class='warning'>Your thrusters set seems to be broken!</span>")
-			return 0
+			return FALSE
 		if(allow_thrust(0.01))
 			on = TRUE
 			ion_trail.start()

code/modules/surgery/organs/organ_internal.dm

@@ -35,13 +35,13 @@
 	if(organ_flags & ORGAN_EDIBLE)
 		AddComponent(/datum/component/edible, food_reagents, null, RAW | MEAT | GROSS, null, 10, null, null, null, CALLBACK(src, .proc/OnEatFrom))
 
-/obj/item/organ/proc/Insert(mob/living/carbon/M, special = 0, drop_if_replaced = TRUE)
+/obj/item/organ/proc/Insert(mob/living/carbon/M, special = FALSE, drop_if_replaced = TRUE)
 	if(!iscarbon(M) || owner == M)
 		return
 
 	var/obj/item/organ/replaced = M.getorganslot(slot)
 	if(replaced)
-		replaced.Remove(M, special = 1)
+		replaced.Remove(M, special = TRUE)
 		if(drop_if_replaced)
 			replaced.forceMove(get_turf(M))
 		else

code/modules/surgery/prosthetic_replacement.dm

@@ -8,10 +8,11 @@
 
 /datum/surgery/prosthetic_replacement/can_start(mob/user, mob/living/carbon/target)
 	if(!iscarbon(target))
-		return 0
+		return FALSE
 	var/mob/living/carbon/C = target
 	if(!C.get_bodypart(user.zone_selected)) //can only start if limb is missing
-		return 1
+		return TRUE
+	return FALSE
 
 
 

code/modules/surgery/surgery_helpers.dm

@@ -32,42 +32,42 @@
 	switch(location)
 		if(BODY_ZONE_HEAD)
 			if(covered_locations & HEAD)
-				return 0
+				return FALSE
 		if(BODY_ZONE_PRECISE_EYES)
 			if(covered_locations & HEAD || face_covered & HIDEEYES || eyesmouth_covered & GLASSESCOVERSEYES)
-				return 0
+				return FALSE
 		if(BODY_ZONE_PRECISE_MOUTH)
 			if(covered_locations & HEAD || face_covered & HIDEFACE || eyesmouth_covered & MASKCOVERSMOUTH || eyesmouth_covered & HEADCOVERSMOUTH)
-				return 0
+				return FALSE
 		if(BODY_ZONE_CHEST)
 			if(covered_locations & CHEST)
-				return 0
+				return FALSE
 		if(BODY_ZONE_PRECISE_GROIN)
 			if(covered_locations & GROIN)
-				return 0
+				return FALSE
 		if(BODY_ZONE_L_ARM)
 			if(covered_locations & ARM_LEFT)
-				return 0
+				return FALSE
 		if(BODY_ZONE_R_ARM)
 			if(covered_locations & ARM_RIGHT)
-				return 0
+				return FALSE
 		if(BODY_ZONE_L_LEG)
 			if(covered_locations & LEG_LEFT)
-				return 0
+				return FALSE
 		if(BODY_ZONE_R_LEG)
 			if(covered_locations & LEG_RIGHT)
-				return 0
+				return FALSE
 		if(BODY_ZONE_PRECISE_L_HAND)
 			if(covered_locations & HAND_LEFT)
-				return 0
+				return FALSE
 		if(BODY_ZONE_PRECISE_R_HAND)
 			if(covered_locations & HAND_RIGHT)
-				return 0
+				return FALSE
 		if(BODY_ZONE_PRECISE_L_FOOT)
 			if(covered_locations & FOOT_LEFT)
-				return 0
+				return FALSE
 		if(BODY_ZONE_PRECISE_R_FOOT)
 			if(covered_locations & FOOT_RIGHT)
-				return 0
+				return FALSE
 
-	return 1
+	return TRUE