Adds update_appearance (this is friggin big news) (#19643)

* update icon and update appearance

* update name

* fixes

* Removes double parent calls from many things

* More fixes

* minor fixes

* fuck

* A!

* general annoyances in this PR

* going in specific fixes

* remove remaining update icons and hud fixes

* Mass replace update icon with update icon state/overlays

* compile

* push my work so far

* goes back on things I broke

* a

* goes through like 80 more cases

* going through more update icons

* compile again

* thank you tattax

* Goes through the remaining update icon

* fix CI cries

* Fixes cigs, canisters and guncases

* Fixes airlock unres sides

* Fixes the flash

* Fixes cryo cells

* gun fix

* Egun fixes

* fixes mini eguns

* Update energy.dm

* Fixes MMIs

* Fixes security level interface

* Fixes cigar cases

* Bow & Critter crate fixes

* Fixes signalers

* Fix canisters again

* re-adds blinking red

* Fixes solar panels

* Fixes cryogenics (and forced standing)

* Update cryo.dm

* sechailer fix

* Maybe fixes pitch black roundstart APCs

* Update apc.dm

* yet another egun fix

* Fixes plasmamen helmets among other stuff

* Fixes canisters for good

* Fixes booze dispensers

* Fixes new icon updates people added

* Probably fixes ballistic guns

* i give up lol

tgui/docs/tutorial-and-examples.md

@@ -84,7 +84,7 @@ input. The input's `action` and `params` are passed to the proc.
       return FALSE
     color = new_color
     . = TRUE
-  update_icon()
+  update_appearance(UPDATE_ICON)
 ```
 
 The `..()` (parent call) is very important here, as it is how we check that the
@@ -312,7 +312,7 @@ upon code review):
       // A demo of proper input sanitation.
       var = CLAMP(newvar, min_val, max_val)
       . = TRUE
-  update_icon() // Not applicable to all objects.
+  update_appearance(UPDATE_ICON) // Not applicable to all objects.
 ```
 
 And the template: