Fix DPI scaling with TGUI, TGUI Say, and Tooltips (#20734)

Got tired of the issues here when working on something else.

Ported several PRs from /tg/station to fix DPI scaling issues. This was
not a problem before 516, however 516 now respects Window's DPI setting,
causing misalignment in several of our UI elements.

This PR implements these ~~four~~ ~~five~~ six PRs:
https://github.com/tgstation/tgstation/pull/65686
https://github.com/tgstation/tgstation/pull/89994
https://github.com/tgstation/tgstation/pull/90416
https://github.com/tgstation/tgstation/pull/90418
https://github.com/tgstation/tgstation/pull/90796
https://github.com/cmss13-devs/cmss13/pull/8734

~~Does not include fixes with TGUI-Say. /tg/station refactored TGUI-Say
after their port to React before they fixed DPI scaling, and this would
be pain to deconstruct to port over to Inferno. Since porting to React
is "inevitable", I considered it not worth my time to fix this.~~

Thanks to the assistance of harry, TGUI-Say fixes now included.

code/modules/admin/verbs/access_control.dm

@@ -6,7 +6,7 @@
 		return
 
 	var/datum/browser/config_window = new(usr, "access_control", "Access Control")
-	config_window.add_head_content("<title>Access Control</title>")
+	config_window.set_head_content("<title>Access Control</title>")
 
 	var/data = "These settings control who can access the server during this round.<br>"
 	data += "They must be reset every single time the server restarts.<br>"