Basic Mob Gorillas (#78918)

Now we can make basic mobs with hands easily so I did, they don't
actually use their hands for anything with AI.
In the future we can come back and share the monkey AI where they pick
up items to hit people with, but frankly few weapons are more deadly
than a gorilla's fists.

IIRC I didn't really change their behaviour much, this is mostly just a
straight conversion. Main difference is that they will prioritise eating
nearby bananas and fruit salads over punching people.

When I make these conversions nowadays I need to decide between "does
this attack at the speed that it did as an NPC mob or the speed it did
as a player?"
I am arbitrarily deciding that gorillas are usually not players and
electing for the former, but tell me if you disagree.

I also made "show basic inhand sprites" into a component shared by
Gorillas, Drones, and Dextrous Guardians (all also now available to
become basic, once I get around to it),

And I added an AI behaviour to run a basic emote. This is similar but
different to "random speech", which kind of sucks and needs rewriting
anyway.
Gorillas don't speak, only ooga.

https://www.youtube.com/watch?v=npuuTBlEb1U

🆑
refactor: Gorillas now use the basic mob framework. Please report any
unusual side effects.
/🆑

code/__DEFINES/ai/ai_blackboard.dm

@@ -27,6 +27,11 @@
 /// Something the mob will remote when calling reinforcements
 #define BB_REINFORCEMENTS_EMOTE "BB_reinforcements_emote"
 
+/// Store a single or list of emotes at this key
+#define BB_EMOTE_KEY "BB_emotes"
+/// Chance to perform an emote per second
+#define BB_EMOTE_CHANCE "BB_EMOTE_CHANCE"
+
 ///Turf we want a mob to move to
 #define BB_TRAVEL_DESTINATION "BB_travel_destination"
 

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

@@ -584,10 +584,6 @@ There are several things that need to be remembered:
 			hand_overlay.pixel_y += dna.species.offset_features[OFFSET_HANDS][2]
 
 		hands += hand_overlay
-
-
-	overlays_standing[HANDS_LAYER] = hands
-	apply_overlay(HANDS_LAYER)
 	return hands
 
 /proc/wear_female_version(t_color, icon, layer, type, greyscale_colors)

code/modules/mob/mob_update_icons.dm

@@ -29,6 +29,7 @@
 
 ///Updates the held items overlay(s) & HUD element.
 /mob/proc/update_held_items()
+	SHOULD_CALL_PARENT(TRUE)
 	SEND_SIGNAL(src, COMSIG_MOB_UPDATE_HELD_ITEMS)
 
 ///Updates the mask overlay & HUD element.