Makes all global variables handled by the GLOB controller (#13152)

* Handlers converted, now to fix 3532 compile errors

* 3532 compile fixes later, got runtimes on startup

* Well the server loads now atleast

* Take 2

* Oops

code/modules/error_handler/error_viewer.dm

@@ -8,10 +8,10 @@
 //   right here:
 
 #ifdef DEBUG
-var/global/datum/ErrorViewer/ErrorCache/error_cache = new()
+GLOBAL_DATUM_INIT(error_cache, /datum/ErrorViewer/ErrorCache, new())
 #else
 // If debugging is disabled, there's nothing useful to log, so don't bother.
-var/global/datum/ErrorViewer/ErrorCache/error_cache = null
+GLOBAL_DATUM(error_cache, /datum/ErrorViewer/ErrorCache)
 #endif
 
 // - ErrorSource datums exist for each line (of code) that generates an error,
@@ -80,7 +80,7 @@ var/global/datum/ErrorViewer/ErrorCache/error_cache = null
 
 /datum/ErrorViewer/ErrorCache/showTo(var/user, var/datum/ErrorViewer/back_to, var/linear)
 	var/html = buildHeader(null, linear, refreshable=1)
-	html += "[total_runtimes] runtimes, [total_runtimes_skipped] skipped<br><br>"
+	html += "[GLOB.total_runtimes] runtimes, [GLOB.total_runtimes_skipped] skipped<br><br>"
 	if(!linear)
 		html += "organized | [makeLink("linear", null, 1)]<hr>"
 		var/datum/ErrorViewer/ErrorSource/error_source
@@ -130,7 +130,7 @@ var/global/datum/ErrorViewer/ErrorCache/error_cache = null
 
 /datum/ErrorViewer/ErrorSource/showTo(var/user, var/datum/ErrorViewer/back_to, var/linear)
 	if(!istype(back_to))
-		back_to = error_cache
+		back_to = GLOB.error_cache
 	var/html = buildHeader(back_to, refreshable=1)
 	for(var/datum/ErrorViewer/ErrorEntry/error_entry in errors)
 		html += "<p class='runtime_list'>[error_entry.makeLink(null, src)]<br></p>"