Strays away from GLOB.machines when possible (#71100)

## About The Pull Request

This replaces needless GLOB.machines with more precise lists whenever
one existed, plus adding a new one for CTF machines.

## Why It's Good For The Game

GLOB.machines holds every single /obj/machinery in the game, so checking
the whole list for stuff is pretty big. This aims to cut that down by
using smaller lists whenever possible. I also gave CTF a new list
because it checked machines very often.

## Changelog

Nothing player facing.

code/modules/modular_computers/file_system/programs/secureye.dm

@@ -171,7 +171,7 @@
 // Returns the list of cameras accessible from this computer
 /datum/computer_file/program/secureye/proc/get_available_cameras()
 	var/list/L = list()
-	for (var/obj/machinery/camera/cam in GLOB.cameranet.cameras)
+	for (var/obj/machinery/camera/cam as anything in GLOB.cameranet.cameras)
 		if(!is_station_level(cam.z))//Only show station cameras.
 			continue
 		L.Add(cam)