Fastboot (#2761)

Adds a config option that disables some time consuming bootup steps that aren't generally required for debugging.

code/controllers/configuration.dm

@@ -245,6 +245,7 @@ var/list/gamemode_cache = list()
 
 	// Master Controller settings.
 	var/mc_init_tick_limit = TICK_LIMIT_MC_INIT_DEFAULT
+	var/fastboot = FALSE	// If true, take some shortcuts during boot to speed it up for testing. Probably should not be used on production servers.
 
 	//UDP GELF Logging
 	var/log_gelf_enabled = 0
@@ -285,6 +286,11 @@ var/list/gamemode_cache = list()
 					src.votable_modes += M.config_tag
 	src.votable_modes += "secret"
 
+#ifdef UNIT_TEST
+	fastboot = TRUE
+	world.log << "UNIT_TEST present. Forcing fastboot on."
+#endif 
+
 /datum/configuration/proc/load(filename, type = "config") //the type can also be game_options, in which case it uses a different switch. not making it separate to not copypaste code - Urist
 	var/list/Lines = file2list(filename)
 
@@ -819,6 +825,9 @@ var/list/gamemode_cache = list()
 				if("access_warn_vms")
 					access_warn_vms = text2num(value)
 
+				if("fastboot")
+					fastboot = TRUE
+
 				else
 					log_misc("Unknown setting in configuration: '[name]'")