Reorganzied Holo Minimaps into SSholomaps subsystem.

Running its init as part of proper init sequence lets us time it properly.
Plus its nicer than the hacky override of the old master controller.

code/controllers/subsystems/holomaps_vr.dm

@@ -0,0 +1,24 @@
+//
+// Holo-Minimaps Generation Subsystem handles initialization of the holo minimaps.
+// Look in code/modules/holomap/generate_holomap.dm to find generateHoloMinimaps()
+//
+SUBSYSTEM_DEF(holomaps)
+	name = "HoloMiniMaps"
+	init_order = INIT_ORDER_HOLOMAPS
+	flags = SS_NO_FIRE
+	var/static/holomaps_initialized = FALSE
+	var/static/list/holoMiniMaps = list()
+	var/static/list/extraMiniMaps = list()
+	var/static/list/station_holomaps = list()
+
+/datum/controller/subsystem/holomaps/Recover()
+	flags |= SS_NO_INIT // Make extra sure we don't initialize twice.
+
+/datum/controller/subsystem/holomaps/Initialize(timeofday)
+	generateHoloMinimaps()
+	. = ..()
+
+/datum/controller/subsystem/holomaps/stat_entry(msg)
+	if (!Debug2)
+		return // Only show up in stat panel if debugging is enabled.
+	. = ..()