Port -tg-station cameranets

This should make it much easier to port abductors, if we ever want to do
that.

Changes:
  - Fixed a bug where the AI could not delete photos it takes.
  - Ported -tg- cameranets. This means that all of our camera based systems are more or less up to date with -tg-; 510 features are missing.
  - An AI with the 'camera lights' mode on will now, instead of the button toggling the closest camera's light, toggle camera lights on/off as the AI moves.
  - It now takes a minimum of 30 deciseconds between attempting to track someone, and locking on. This number is increased by their distance away from the AI eye.
  - The camera activate/deactivate proc is now called 'toggle_cam'.
  - The 'trackable' proc has been replaced by a more object-oriented 'mob.can_track()' proc.
  - The 'networks' section of the security camera console is now above the camera list.

In laymans terms: This refactors how security cameras calculate what
viewers can see, and adds a few neat features on top.

code/modules/computer3/computers/camera.dm

@@ -190,7 +190,6 @@
 			if(temp.len)
 				L.Add(C)
 
-		cameranet.process_sort()
 
 		return L
 	verify_machine(var/obj/machinery/camera/C,var/datum/file/camnet_key/key = null)