Check for 516 byond:// hrefs (#16359)

* Add a lint to check for hrefs that don't start with byond://

* Regex convert href links

* Regex convert _src_ as well

* Clean up the last few

* Missed a few

code/modules/flufftext/Hallucination.dm

@@ -204,7 +204,7 @@ Gunshots/explosions/opening doors/less rare audio (done)
 
 			var/button_txt = pick(possible_txt)
 
-			mocktxt += "<a href='?src=\ref[src];[button]'>[button_txt]</a><br>"
+			mocktxt += "<a href='byond://?src=\ref[src];[button]'>[button_txt]</a><br>"
 
 			buttons -= button
 			possible_txt -= button_txt