Dog wit the butter (feat. a bunch of dog-related code improvements) (#77039)

## About The Pull Request
Adds a `dog_fashion` for the stick of butter.(screenshot is outdated as
Lisa won't have butter no more)
![butter
dawgs](https://github.com/tgstation/tgstation/assets/75863639/a22e702c-98a8-4283-abd9-28d4a9fb3bd0)

Also cleans up dog.dm because it was SHIT and FUCK and MY FUCKING GOD
TWO INITIALIZE()s TWO TIMES IN A SINGLE FILE WHAT IN THE GODDAMN

Most noticeably, Lisa properly won't wear any hats, and puppies properly
can't wear head/back items (by just removing those item slots from the
strip/equip menu. if some admeme wants to fumble around they may still
equip shit there. but otherwise for a normal player those slots are
inaccessible).
Basic mobs now also send signals when they run
`appear_dead`/`appear_alive` procs, which corgis hook into to update
their dead fashion overlays.
The side-effect of getting that to work is that dogs (and any basic mob
that uses `play_dead` ai behavior) are so good at feigning death, that
they fool medical HUDs and other related things. They're just that good.
There's a bunch of other things involved and I was mostly just being
angry at the state of the file so I'll check back when I gather all
things changed.


![strippy](https://github.com/tgstation/tgstation/assets/75863639/ec4d17a2-d4df-401c-bd1f-7c4ee1b95671)


## Why It's Good For The Game


https://github.com/tgstation/tgstation/assets/75863639/b34589cb-94d6-4b80-bf0f-1814c08da100



## Changelog
🆑
add: dog with a butter on 'em
add: dead dog with da butter on 'em (dogs feigning death are so good at
it, they appear dead to medical HUDs and other things)
add: Nars-Ian now can revive from the dead if he consumes a pet
fix: fixes dog fashion items with no speech modifiers set making dressed
up corgis unable to perform their speech or emote behaviors
fix: fixes old Ian losing his mobility ride when shaved with a razor
fix: fixes pets not dropping their collar when gibbed
fix: butter don't go on Lisa and corgi puppies (Lisa won't wear hats and
corgi puppies can't wear hats and back slot items)
/🆑

code/modules/mob/living/basic/basic.dm

@@ -151,6 +151,7 @@
 		transform = transform.Turn(180)
 	if(!(basic_mob_flags & REMAIN_DENSE_WHILE_DEAD))
 		ADD_TRAIT(src, TRAIT_UNDENSE, BASIC_MOB_DEATH_TRAIT)
+	SEND_SIGNAL(src, COMSIG_BASICMOB_LOOK_DEAD)
 
 /mob/living/basic/revive(full_heal_flags = NONE, excess_healing = 0, force_grab_ghost = FALSE)
 	. = ..()
@@ -165,6 +166,7 @@
 		transform = transform.Turn(180)
 	if(!(basic_mob_flags & REMAIN_DENSE_WHILE_DEAD))
 		REMOVE_TRAIT(src, TRAIT_UNDENSE, BASIC_MOB_DEATH_TRAIT)
+	SEND_SIGNAL(src, COMSIG_BASICMOB_LOOK_ALIVE)
 
 /mob/living/basic/update_sight()
 	lighting_color_cutoffs = list(lighting_cutoff_red, lighting_cutoff_green, lighting_cutoff_blue)