Bools and returns super-pr (#53221)

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>

code/game/objects/effects/effect_system/effects_foam.dm

@@ -162,14 +162,14 @@
 
 /obj/effect/particle_effect/foam/proc/foam_mob(mob/living/L)
 	if(lifetime<1)
-		return 0
+		return FALSE
 	if(!istype(L))
-		return 0
+		return FALSE
 	var/fraction = 1/initial(reagent_divisor)
 	if(lifetime % reagent_divisor)
 		reagents.expose(L, VAPOR, fraction)
 	lifetime--
-	return 1
+	return TRUE
 
 /obj/effect/particle_effect/foam/proc/spread_foam()
 	var/turf/t_loc = get_turf(src)

code/game/objects/effects/effect_system/effects_other.dm

@@ -85,11 +85,11 @@
 
 /datum/effect_system/reagents_explosion
 	var/amount 						// TNT equivalent
-	var/flashing = 0			// does explosion creates flash effect?
+	var/flashing = FALSE			// does explosion creates flash effect?
 	var/flashing_factor = 0		// factor of how powerful the flash effect relatively to the explosion
 	var/explosion_message = 1				//whether we show a message to mobs.
 
-/datum/effect_system/reagents_explosion/set_up(amt, loca, flash = 0, flash_fact = 0, message = 1)
+/datum/effect_system/reagents_explosion/set_up(amt, loca, flash = FALSE, flash_fact = 0, message = TRUE)
 	amount = amt
 	explosion_message = message
 	if(isturf(loca))

code/game/objects/effects/effect_system/effects_smoke.dm

@@ -12,7 +12,7 @@
 	layer = FLY_LAYER
 	anchored = TRUE
 	mouse_opacity = MOUSE_OPACITY_TRANSPARENT
-	animate_movement = 0
+	animate_movement = FALSE
 	var/amount = 4
 	var/lifetime = 5
 	var/opaque = 1 //whether the smoke can block the view when in enough amount
@@ -49,23 +49,23 @@
 	lifetime--
 	if(lifetime < 1)
 		kill_smoke()
-		return 0
+		return FALSE
 	for(var/mob/living/L in range(0,src))
 		smoke_mob(L)
-	return 1
+	return TRUE
 
 /obj/effect/particle_effect/smoke/proc/smoke_mob(mob/living/carbon/C)
 	if(!istype(C))
-		return 0
+		return FALSE
 	if(lifetime<1)
-		return 0
+		return FALSE
 	if(C.internal != null || C.has_smoke_protection())
-		return 0
+		return FALSE
 	if(C.smoke_delay)
-		return 0
+		return FALSE
 	C.smoke_delay++
 	addtimer(CALLBACK(src, .proc/remove_smoke_delay, C), 10)
-	return 1
+	return TRUE
 
 /obj/effect/particle_effect/smoke/proc/remove_smoke_delay(mob/living/carbon/C)
 	if(C)
@@ -126,11 +126,12 @@
 	lifetime = 8
 
 /obj/effect/particle_effect/smoke/bad/smoke_mob(mob/living/carbon/M)
-	if(..())
+	. = ..()
+	if(.)
 		M.drop_all_held_items()
 		M.adjustOxyLoss(1)
 		M.emote("cough")
-		return 1
+		return TRUE
 
 /obj/effect/particle_effect/smoke/bad/Crossed(atom/movable/AM, oldloc)
 	. = ..()
@@ -148,7 +149,7 @@
 /obj/effect/particle_effect/smoke/freezing
 	name = "nanofrost smoke"
 	color = "#B2FFFF"
-	opaque = 0
+	opaque = FALSE
 
 /datum/effect_system/smoke_spread/freezing
 	effect_type = /obj/effect/particle_effect/smoke/freezing
@@ -226,7 +227,8 @@
 
 
 /obj/effect/particle_effect/smoke/chem/process()
-	if(..())
+	. = ..()
+	if(.)
 		var/turf/T = get_turf(src)
 		var/fraction = 1/initial(lifetime)
 		for(var/atom/movable/AM in T)
@@ -237,20 +239,20 @@
 			reagents.expose(AM, TOUCH, fraction)
 
 		reagents.expose(T, TOUCH, fraction)
-		return 1
+		return TRUE
 
 /obj/effect/particle_effect/smoke/chem/smoke_mob(mob/living/carbon/M)
 	if(lifetime<1)
-		return 0
+		return FALSE
 	if(!istype(M))
-		return 0
+		return FALSE
 	var/mob/living/carbon/C = M
 	if(C.internal != null || C.has_smoke_protection())
-		return 0
+		return FALSE
 	var/fraction = 1/initial(lifetime)
 	reagents.copy_to(C, fraction*reagents.total_volume)
 	reagents.expose(M, INGEST, fraction)
-	return 1
+	return TRUE
 
 
 

code/game/objects/effects/effect_system/effects_water.dm

@@ -14,10 +14,10 @@
 /obj/effect/particle_effect/water/Move(turf/newloc)
 	if (--src.life < 1)
 		qdel(src)
-		return 0
+		return FALSE
 	if(newloc.density)
-		return 0
-	.=..()
+		return FALSE
+	return ..()
 
 /obj/effect/particle_effect/water/Bump(atom/A)
 	if(reagents)