Revert "Revert "Add the option to restrict the Engine that spawn""

This reverts commit d851beea16.

code/controllers/configuration/config_entry.dm

@@ -151,6 +151,7 @@
 	var/key_mode
 	var/value_mode
 	var/splitter = " "
+	var/lowercase = TRUE
 
 /datum/config_entry/keyed_list/New()
 	. = ..()
@@ -167,7 +168,8 @@
 	var/key_value = null
 
 	if(key_pos || value_mode == VALUE_MODE_FLAG)
-		key_name = lowertext(copytext(str_val, 1, key_pos))
+		if(lowercase)
+			key_name = lowertext(copytext(str_val, 1, key_pos))
 		key_value = copytext(str_val, key_pos + 1)
 		var/new_key
 		var/new_value

code/controllers/configuration/entries/game_options.dm

@@ -379,3 +379,9 @@
 /datum/config_entry/number/auto_transfer_delay
 	config_entry_value = 72000
 	min_val = 0
+
+/datum/config_entry/keyed_list/box_random_engine
+	key_mode = KEY_MODE_TEXT
+	value_mode = VALUE_MODE_TEXT
+	lowercase = FALSE
+	splitter = "-"