Adds support for multiple callback checks for the do_after and incapacitated procs (#13057)

* do_after refactor

Update slime.dm

fix a comment

if you read this you get a cookie!

* some little tweaks

Changes a TRUE to FALSE in a comment, got confused there.

Removes the code that checks for non-callbacks in the extra_checks list and removes them. It should be up to the dev to not add non-callbacks to this list. I'd rather have it runtime instead

* check_for_true_callbacks

* CRLF to LF

Co-authored-by: SteelSlayer <SteelSlayer@users.noreply.github.com>

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

@@ -146,11 +146,13 @@
 		return
 
 	var/limb_select = input(H, "Choose a limb to regrow", "Limb Regrowth") as null|anything in missing_limbs
+	if(!limb_select) // If the user hit cancel on the popup, return
+		return
 	var/chosen_limb = missing_limbs[limb_select]
 
 	H.visible_message("<span class='notice'>[H] begins to hold still and concentrate on [H.p_their()] missing [limb_select]...</span>", "<span class='notice'>You begin to focus on regrowing your missing [limb_select]... (This will take [round(SLIMEPERSON_REGROWTHDELAY/10)] seconds, and you must hold still.)</span>")
-	if(do_after(H, SLIMEPERSON_REGROWTHDELAY, needhand = 0, target = H))
-		if(H.incapacitated())
+	if(do_after(H, SLIMEPERSON_REGROWTHDELAY, FALSE, H, extra_checks = list(CALLBACK(H, /mob.proc/IsStunned)), use_default_checks = FALSE)) // Override the check for weakness, only check for stunned
+		if(H.incapacitated(ignore_lying = TRUE, extra_checks = list(CALLBACK(H, /mob.proc/IsStunned)), use_default_checks = FALSE)) // Override the check for weakness, only check for stunned
 			to_chat(H, "<span class='warning'>You cannot regenerate missing limbs in your current state.</span>")
 			return
 
@@ -196,4 +198,4 @@
 
 #undef SLIMEPERSON_HUNGERCOST
 #undef SLIMEPERSON_MINHUNGER
-#undef SLIMEPERSON_REGROWTHDELAY
+#undef SLIMEPERSON_REGROWTHDELAY

code/modules/mob/living/update_status.dm

@@ -65,8 +65,14 @@
 	return !(IsWeakened() || paralysis || stat || (status_flags & FAKEDEATH))
 
 // Whether the mob is capable of actions or not
-/mob/living/incapacitated(ignore_restraints = FALSE, ignore_grab = FALSE, ignore_lying = FALSE)
-	if(stat || paralysis || stunned || IsWeakened() || (!ignore_restraints && restrained()) || (!ignore_lying && lying))
+/mob/living/incapacitated(ignore_restraints = FALSE, ignore_grab = FALSE, ignore_lying = FALSE, list/extra_checks = list(), use_default_checks = TRUE)
+	// By default, checks for weakness and stunned get added to the extra_checks list.
+	// Setting `use_default_checks` to FALSE means that you don't want it checking for these statuses or you are supplying your own checks.
+	if(use_default_checks)
+		extra_checks += CALLBACK(src, /mob.proc/IsWeakened)
+		extra_checks += CALLBACK(src, /mob.proc/IsStunned)
+
+	if(stat || paralysis || (!ignore_restraints && restrained()) || (!ignore_lying && lying) || check_for_true_callbacks(extra_checks))
 		return TRUE
 
 // wonderful proc names, I know - used to check whether the blur overlay

code/modules/mob/status_procs.dm

@@ -173,6 +173,9 @@
 /mob/proc/Stun()
 	return
 
+/mob/proc/IsStunned()
+	return stunned
+
 /mob/proc/SetStunned()
 	return