Semi Port - Add Wine/Linux users CID to an ignore list (#96484)

## About The Pull Request

This PR attempts to somewhat port
https://github.com/cmss13-devs/cmss13/pull/11252
In order to add Wine/Linux CID into an ignore list to stop the
`Your ComputerID has already logged in with another key this round,
please log out of this one NOW or risk being banned!`
Jumpscare message from appearing and log users which connect with
ignored CID's to admins properly.

### Testing the Pull Reuqest
I've attempted to test the PR locally, but I have been unable to
replicate the duplicated CID message, so this might need to be **test
merged** if approved.

In addition, please review the code, my experience with Byond is very
limited so feel free to edit, commit, or requested changes per need.

## Why It's Good For The Game
If two players with the same CID (such as the case with players who play
using Wine), the joining players will get a pop-up saying they are using
the same CID and get a **scary** message that they risk getting banned
for multiboxing if they don't log off.

Experienced game staff, most of the time already know to ignore the CID
`4055623708` which is often thrown by Wine.

However, players could abuse this fact to still and try to multibox for
whatever reason, and even if a legit Linux player uses this CID, giving
the admins a separate log for it is useful, to be distinct from normal
multibox messages.
`MULTIKEYING: [key_name(src)] Connecting player joined with IGNORED CID
[computer_id].`

## Changelog
🆑 Richard Blonski
admin: Added Ignored CIDs, a message will appear when a player joins
with an Ignored CID.
/🆑

code/controllers/configuration/entries/general.dm

@@ -809,3 +809,6 @@
 
 /datum/config_entry/string/policy_json_path
 	default = "policy.json"
+
+/datum/config_entry/number_list/ignored_cids
+	default = list()

code/controllers/subsystem/stickyban.dm

@@ -4,13 +4,21 @@ SUBSYSTEM_DEF(stickyban)
 
 	var/list/cache = list()
 	var/list/dbcache = list()
-	var/list/confirmed_exempt = list()
+	var/list/ignored_cids = list() // will be used as numeric-keyed map
 	var/dbcacheexpire = 0
 
 
 /datum/controller/subsystem/stickyban/Initialize()
+	// load IGNORED_CIDS as number_list into a fast lookup map
+	var/list/ignored_conf = CONFIG_GET(number_list/ignored_cids)
+	if (ignored_conf && ignored_conf.len)
+		for (var/num in ignored_conf)
+			if (isnum(num))
+				ignored_cids[num2text(num)] = TRUE
+
 	if (length(GLOB.stickybanadminexemptions))
 		restore_stickybans()
+
 	var/list/bannedkeys = sticky_banned_ckeys()
 	//sanitize the sticky ban list