Remove the subsystem and replace it with a glob

code/datums/log_viewer.dm

@@ -36,7 +36,7 @@ if(!result || result.ckey != __ckey){\
 
 	for(var/ckey in ckeys)
 		for(var/log_type in selected_log_types)
-			var/list/logs = SSlogging.get_logs_by_type(ckey, log_type)
+			var/list/logs = GLOB.logging.get_logs_by_type(ckey, log_type)
 			var/len_logs = length(logs)
 			if(len_logs)
 				var/start_index = get_earliest_log_index(logs)
@@ -237,7 +237,7 @@ if(!result || result.ckey != __ckey){\
 		A.on_close(CALLBACK(src, .proc/add_mob, usr))
 		return
 	if(href_list["add_ckey"])
-		var/list/ckeys = SSlogging.get_ckeys_logged()
+		var/list/ckeys = GLOB.logging.get_ckeys_logged()
 		var/datum/async_input/A = input_autocomplete_async(usr, "Please, select a ckey: ", ckeys)
 		A.on_close(CALLBACK(src, .proc/add_ckey, usr))
 		return

code/datums/logging.dm

@@ -0,0 +1,47 @@
+/datum/logging
+	var/list/datum/log_record/logs = list()	// Assoc list of assoc lists (ckey, (log_type, list/logs))
+
+/datum/logging/proc/add_log(ckey, datum/log_record/log)
+	if(!ckey)
+		log_debug("GLOB.logging.add_log called with an invalid ckey")
+		return
+
+	if(!logs[ckey])
+		logs[ckey] = list()
+
+	var/list/log_types_list = logs[ckey]
+
+	if(!log_types_list[log.log_type])
+		log_types_list[log.log_type] = list()
+
+	var/list/datum/log_record/log_records = log_types_list[log.log_type]
+	log_records.Add(log)
+
+/datum/logging/proc/get_ckeys_logged()
+	var/list/ckeys = list()
+	for(var/ckey in logs)
+		ckeys.Add(ckey)
+	return ckeys
+
+/* Returns the logs of a given ckey and log_type
+ * If no logs exist it will return an empty list
+*/
+/datum/logging/proc/get_logs_by_type(ckey, log_type)
+	if(!ckey)
+		log_debug("GLOB.logging.get_logs_by_type called with an invalid ckey")
+		return
+	if(!log_type || !(log_type in ALL_LOGS))
+		log_debug("GLOB.logging.get_logs_by_type called with an invalid log_type '[log_type]'")
+		return
+
+	var/list/log_types_list = logs[ckey]
+	// Check if logs exist for the ckey
+	if(!log_types_list?.len)
+		return list()
+
+	var/list/datum/log_record/log_records = log_types_list[log_type]
+
+	// Check if logs exist for this type
+	if(!log_records)
+		return list()
+	return log_records