MODLink System (+ NWTLMM) (#77639)

## About The Pull Request
A pact made with `@Kapu1178`
Small changes you should not care about:
RD MODsuit outfit (admin only) no longer has a beret that blocks the
activation of the suit
The beret used by death squad officers no longer is blocked from being
put on a hat stabilizer module
Admins can now Shear matrices of objects in Modify Transform
Multitool buffers have been a little refactored to use a setter proc
that saves them from causing hard dels
Cooler stuff:
A revival and remake of [Nobody Wants To Learn Matrix
Math](https://github.com/tgstation/tgstation/pull/59103), this time with
additional tooling for quick matrix calculations.

![image](https://github.com/tgstation/tgstation/assets/23585223/eb387738-0839-463a-aed8-4703d139b11a)
The MODLink system, available through every MODsuit and MODLink scryers
(a neck item obtainable from advanced modsuit research or
charliestation)
Let's you make a holographic call with any other MODLink user, where you
can chat in realtime and see what's up with em

![image](https://github.com/tgstation/tgstation/assets/23585223/5a822f9f-e823-497e-b766-40055f2fc0d6)
![image](https://github.com/tgstation/tgstation/assets/23585223/062983ee-6058-4e78-a3aa-bccda1a3e224)


## Why It's Good For The Game
Adds a fun way for the crew to communicate with each other that can be
done in real-time with relative privacy compared to radio.

## Changelog
🆑 Fikou, Armhulen, Sheets (+rep for Mothblocks and Potato)
fix: RD MODsuit outfit (admin only) no longer has a beret that blocks
the activation of the suit
fix: The beret used by death squad officers no longer is blocked from
being put on a hat stabilizer module
admin: Admins can now Shear matrices of objects in Modify Transform
admin: Admins now have access to Test Matrices in the VV dropdown, an
all-in-one tool for editing transforms.
add: MODLink system, available through scryers (from RnD and Charlie
Station) and through MODsuits. Lets you call people with holographs!
/🆑

code/modules/mod/mod_activation.dm

@@ -158,6 +158,7 @@
 		if(!module.active || (module.allow_flags & MODULE_ALLOW_INACTIVE))
 			continue
 		module.on_deactivation(display_message = FALSE)
+	mod_link.end_call()
 	activating = TRUE
 	to_chat(wearer, span_notice("MODsuit [active ? "shutting down" : "starting up"]."))
 	if (ai_assistant)
@@ -227,17 +228,15 @@
 		if (!seal && wearer?.invalid_internals())
 			wearer.cutoff_internals()
 
-/// Finishes the suit's activation, starts processing
+/// Finishes the suit's activation
 /obj/item/mod/control/proc/finish_activation(on)
 	active = on
 	if(active)
 		for(var/obj/item/mod/module/module as anything in modules)
 			module.on_suit_activation()
-		START_PROCESSING(SSobj, src)
 	else
 		for(var/obj/item/mod/module/module as anything in modules)
 			module.on_suit_deactivation()
-		STOP_PROCESSING(SSobj, src)
 	update_speed()
 	update_icon_state()
 	wearer.update_clothing(slot_flags)