Adds tgui color picker (#94313)

## About The Pull Request

Ports https://github.com/Monkestation/Monkestation2.0/pull/1231 which is
a port of https://github.com/BeeStation/BeeStation-Hornet/pull/9417
which is a port of https://github.com/omgovich/react-colorful/
Also a port of
https://github.com/effigy-se/effigy/blob/main/tgui/packages/tgui/interfaces/effigy/ColorPickerModal.tsx
for hex color presets

Admin stuff got excluded (pref-like picker, filterrific, get-variables)



https://github.com/user-attachments/assets/7069bef9-81cd-4636-bf68-cbad227ef09e


## Why It's Good For The Game

It's one of the only input areas that still doesn't use TGUI, leaving
darkmode players flashbanged every single time a color selection UI is
opened. This is also just visually great and I think a big upgrade from
byond's.

## Changelog

🆑 omgovich, itsmeow, Absolucy, JohnFulpWillard, jlsnow301, TealSeer,
lessthnthree
add: Color selection panels now use TGUI (If you have TGUI enabled in
settings).
/🆑

code/modules/modular_computers/computers/item/computer_ui.dm

@@ -176,7 +176,7 @@
 			var/mob/user = usr
 			var/new_color
 			while(!new_color)
-				new_color = input(user, "Choose a new color for [src]'s flashlight.", "Light Color",light_color) as color|null
+				new_color = tgui_color_picker(user, "Choose a new color for [src]'s flashlight.", "Light Color",light_color)
 				if(!new_color)
 					return
 				if(is_color_dark(new_color, 50) ) //Colors too dark are rejected