[MIRROR] Drastic Lag Mitigation Subsystem: SSlag_switch (#6786)

* Drastic Lag Mitigation Subsystem: SSlag_switch (#59717)

Requested by oranges and inspired by the upcoming event. A new subsyetem, non-processing (for now), aimed at providing some toggle switches that can be flipped as a last ditch effort to save some CPU cycles by sacrificing some non-critical mechanics. Below you can see each individual toggle.

Screenshot of the admin panel:
image
Surely there are more opportunities for toggles I missed, but adding new ones is not very difficult at all.
Why It's Good For The Game

Better performance during extreme pop, I hope.
Changelog

cl
code: Introduces the Lag Switch subsystem for when a smoother experience is worth trading a few bells and whistles for. Performance enhancement measures can be togged by admins with the Show Lag Switches admin verb or enabled automatically at a pop amount set via config.
config: Added a new config var: number/auto_lag_switch_pop

* Drastic Lag Mitigation Subsystem: SSlag_switch

* mirrored the changes to the modular file

Co-authored-by: Wayland-Smithy <64715958+Wayland-Smithy@users.noreply.github.com>
Co-authored-by: Useroth <37159550+Useroth@users.noreply.github.com>

code/modules/client/client_defines.dm

@@ -32,6 +32,8 @@
 	var/externalreplyamount = 0
 	///When was the last time we warned them about not cryoing without an ahelp, set to -5 minutes so that rounstart cryo still warns
 	COOLDOWN_DECLARE(cryo_warned)
+	///Tracks say() usage for ic/dchat while slowmode is enabled
+	COOLDOWN_DECLARE(say_slowmode)
 		/////////
 		//OTHER//
 		/////////

code/modules/client/client_procs.dm

@@ -452,6 +452,7 @@ GLOBAL_LIST_INIT(blacklisted_builds, list(
 	view_size.setZoomMode()
 	fit_viewport()
 	Master.UpdateTickRate()
+	SEND_GLOBAL_SIGNAL(COMSIG_GLOB_CLIENT_CONNECT, src)
 
 //////////////
 //DISCONNECT//