Refactors CTF (#74342)

## About The Pull Request
CTF code is rather infamous for being poor and hard to actually work
with, I wanted to add a feature for a mapping march project but the code
would not allow for it, so here we are refactoring the entire thing.
## Why It's Good For The Game

Replaces some really bad code with slightly less bad code. Should make
it much easier to add features onto CTF in the future.
## Changelog
🆑
refactor: CTF has been entirely refactored.
fix: Respawn times for CTF now work.
qol: CTF players are alerted during control point games when one team is
half way to winning.
admin: CTF instagib mode can now be toggled from the secrets panel.
/🆑

code/modules/admin/topic.dm

@@ -1487,7 +1487,7 @@
 	else if(href_list["ctf_toggle"])
 		if(!check_rights(R_ADMIN))
 			return
-		toggle_id_ctf(usr, "centcom")
+		toggle_id_ctf(usr, CTF_GHOST_CTF_GAME_ID)
 
 	else if(href_list["rebootworld"])
 		if(!check_rights(R_ADMIN))