Sleeping tweaks, at-will wakes (#21452)

Species capable of indefinite sleep can now wake up from being asleep at
will by pressing "Sleep" again.

IPCs will also no longer beep constantly when sleeping. This is part of
a `snores` variable that can be toggled on other species too in lieu of
a `snore_key` variable.

Unfortunately does not make IPCs stop consuming charge when asleep.
Tried it, it's one hell of a spaghetticode nightmare for a result that
really doesn't matter that much. Might revisit once the IPC rework gets
merged.

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

@@ -398,7 +398,16 @@
 	set category = "IC"
 
 	if(usr.sleeping)
-		to_chat(usr, SPAN_WARNING("You are already asleep."))
+		if(species && species.indefinite_sleep) // Species can wake up at will when sleeping.
+			to_chat(usr, SPAN_NOTICE("You start to wake up."))
+			if(usr.sleeping_indefinitely)
+				to_chat(usr, SPAN_NOTICE("You will no longer sleep indefinitely."))
+				usr.sleeping_indefinitely = FALSE // Stop any glitches from happening with overriding indefinite sleep.
+
+			usr.sleeping = 1 // Wake up soon.
+			usr.eye_blurry = 1
+		else
+			to_chat(usr, SPAN_WARNING("You are already asleep."))
 		return
 	if(alert(src,"Are you sure you want to sleep for a while?", "Sleep", "Yes", "No") == "Yes")
 		willfully_sleeping = TRUE

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

@@ -796,7 +796,7 @@
 					else
 						AdjustSleeping(-1)
 			if(prob(2) && health && !failed_last_breath && !InStasis())
-				if(!paralysis)
+				if(!paralysis && species.snores)
 					emote(species.snore_key)
 
 		//CONSCIOUS

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

@@ -361,6 +361,10 @@
 	 * The key of the emote to play when this species is sleeping
 	 */
 	var/snore_key = "snore"
+	/**
+	 * Whether or not this species snores when sleeping
+	 */
+	var/snores = TRUE
 	/**
 	 * Whether this species can choose to sleep indefinitely
 	 */

code/modules/mob/living/carbon/human/species/station/ipc/ipc.dm

@@ -145,7 +145,7 @@
 	psi_deaf = TRUE
 
 	sleeps_upright = TRUE
-	snore_key = "beep"
+	snores = FALSE
 	indefinite_sleep = TRUE
 
 /datum/species/machine/handle_post_spawn(var/mob/living/carbon/human/H)