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/datums/chatmessage.dm

@@ -193,7 +193,7 @@
 /datum/chatmessage/proc/finish_image_generation(mheight, atom/target, mob/owner, complete_text, lifespan)
 	var/rough_time = REALTIMEOFDAY
 	approx_lines = max(1, mheight / CHAT_MESSAGE_APPROX_LHEIGHT)
-
+	var/starting_height = target.maptext_height
 	// Translate any existing messages upwards, apply exponential decay factors to timers
 	message_loc = isturf(target) ? target : get_atom_on_turf(target)
 	if (owned_by.seen_messages)
@@ -208,7 +208,12 @@
 			// When choosing to update the remaining time we have to be careful not to update the
 			// scheduled time once the EOL has been executed.
 			if (time_spent >= time_before_fade)
-				animate(m.message, pixel_y = m.message.pixel_y + mheight, time = CHAT_MESSAGE_SPAWN_TIME, flags = ANIMATION_PARALLEL)
+				if(m.message.pixel_y < starting_height)
+					var/max_height = m.message.pixel_y + m.approx_lines * CHAT_MESSAGE_APPROX_LHEIGHT - starting_height
+					if(max_height > 0)
+						animate(m.message, pixel_y = m.message.pixel_y + max_height, time = CHAT_MESSAGE_SPAWN_TIME, flags = ANIMATION_PARALLEL)
+				else if(mheight + starting_height >= m.message.pixel_y)
+					animate(m.message, pixel_y = m.message.pixel_y + mheight, time = CHAT_MESSAGE_SPAWN_TIME, flags = ANIMATION_PARALLEL)
 				continue
 
 			var/remaining_time = time_before_fade * (CHAT_MESSAGE_EXP_DECAY ** idx++) * (CHAT_MESSAGE_HEIGHT_DECAY ** combined_height)
@@ -225,7 +230,12 @@
 				animate(alpha = 0, time = CHAT_MESSAGE_EOL_FADE)
 			// We run this after the alpha animate, because we don't want to interrup it, but also don't want to block it by running first
 			// Sooo instead we do this. bit messy but it fuckin works
-			animate(m.message, pixel_y = m.message.pixel_y + mheight, time = CHAT_MESSAGE_SPAWN_TIME, flags = ANIMATION_PARALLEL)
+			if(m.message.pixel_y < starting_height)
+				var/max_height = m.message.pixel_y + m.approx_lines * CHAT_MESSAGE_APPROX_LHEIGHT - starting_height
+				if(max_height > 0)
+					animate(m.message, pixel_y = m.message.pixel_y + max_height, time = CHAT_MESSAGE_SPAWN_TIME, flags = ANIMATION_PARALLEL)
+			else if(mheight + starting_height >= m.message.pixel_y)
+				animate(m.message, pixel_y = m.message.pixel_y + mheight, time = CHAT_MESSAGE_SPAWN_TIME, flags = ANIMATION_PARALLEL)
 
 	// Reset z index if relevant
 	if (current_z_idx >= CHAT_LAYER_MAX_Z)
@@ -236,7 +246,7 @@
 	SET_PLANE_EXPLICIT(message, RUNECHAT_PLANE, message_loc)
 	message.appearance_flags = APPEARANCE_UI_IGNORE_ALPHA | KEEP_APART
 	message.alpha = 0
-	message.pixel_y = target.maptext_height
+	message.pixel_y = starting_height
 	message.pixel_x = -target.base_pixel_x
 	message.maptext_width = CHAT_MESSAGE_WIDTH
 	message.maptext_height = mheight * 1.25 // We add extra because some characters are superscript, like actions