Refactored do_after to use a flag-based system for options (#17127)

* Refactored do_after to use a flag-based system for options

* More flags

* Ditto

* Use the HAS_FLAG macro

* do_after pass

* Fix burning paper code

* Resolve issues from Fluffy's code reviews

* .

code/modules/projectiles/gun.dm

@@ -584,7 +584,7 @@
 
 	mouthshoot = TRUE
 	M.visible_message(SPAN_DANGER("\The [user] sticks \the [src] in their mouth, their finger ready to pull the trigger..."))
-	if(!do_after(user, 40))
+	if(!do_after(user, 4 SECONDS))
 		M.visible_message(SPAN_GOOD("\The [user] takes \the [src] out of their mouth."))
 		mouthshoot = FALSE
 		return

code/modules/projectiles/guns/energy/crank.dm

@@ -42,7 +42,7 @@
 		playsound(user.loc, 'sound/items/crank.ogg', 60, 1)
 		is_charging = TRUE
 		flick("crank", src)
-		if(do_after(user,20))
+		if(do_after(user,2 SECONDS))
 			to_chat(user, "<span class='notice'>You finish charging \the [src].</span>")
 			power_supply.give(charge_cost)
 			update_maptext()

code/modules/projectiles/guns/projectile/shotgun.dm

@@ -81,7 +81,7 @@
 
 /obj/item/gun/projectile/shotgun/pump/proc/pump(mob/M)
 	if(!wielded)
-		if(!do_after(M, 20, TRUE)) // have to stand still for 2 seconds instead of doing it instantly. bad idea during a shootout
+		if(!do_after(M, 2 SECONDS)) // have to stand still for 2 seconds instead of doing it instantly. bad idea during a shootout
 			return
 
 	playsound(M, rack_sound, 60, FALSE)