Paradise error handler (#10571)

* Ports the Paradise error handler.

Made by @Krausus

Initial code port, it compiles!

* It now looks cool!

All kinds of fancy CSS and HTML things.

* Stuff

Fixes Comic's comments.

Ports some more changes from Paradise.

The src from the machinery process is NOT included. I consider stack
traces more valuable.

code/controllers/configuration.dm

@@ -174,6 +174,12 @@
 
 	var/enable_roundstart_away_missions = 0
 
+	// Error handler config options.
+	var/error_cooldown = 600 // The "cooldown" time for each occurrence of a unique error
+	var/error_limit = 9 // How many occurrences before the next will silence them
+	var/error_silence_time = 6000 // How long a unique error will be silenced for
+	var/error_msg_delay = 50 // How long to wait between messaging admins about occurrences of a unique error
+
 /datum/configuration/New()
 	. = ..()
 	var/list/L = typesof(/datum/game_mode) - /datum/game_mode
@@ -544,6 +550,15 @@
 					enable_roundstart_away_missions = 1
 				if("enable_wages")
 					roundstart_enable_wages = 1
+				if("error_cooldown")
+					error_cooldown = value
+				if("error_limit")
+					error_limit = value
+				if("error_silence_time")
+					error_silence_time = value
+				if("error_msg_delay")
+					error_msg_delay = value
+
 				else
 					diary << "Unknown setting in configuration: '[name]'"