Add mcl_clock item stereotype

mods/HUD/mcl_craftguide/depends.txt

@@ -1,2 +1,3 @@
 mcl_core
 mcl_compass
+mcl_clock

mods/HUD/mcl_craftguide/init.lua

@@ -49,6 +49,7 @@ local group_stereotypes = {
 	quartz_block = "mcl_nether:quartz_block",
 	mesecon_conductor_craftable = "mesecons:wire_00000000_off",
 	compass      = mcl_compass.stereotype,
+	clock        = mcl_clock.sterotype,
 }
 
 local group_names = {

mods/ITEMS/mcl_clock/init.lua

@@ -4,6 +4,8 @@
   Original from Echo, here: http://forum.minetest.net/viewtopic.php?id=3795
 ]]--
 
+mcl_clock = {}
+
 local watch = {}
 watch.old_time = -1
 
@@ -97,3 +99,5 @@ for a=0,63,1 do
 	end
 	watch.register_item("mcl_clock:clock_"..tostring(a), watch.images[b+1], false)
 end
+
+mcl_clock.stereotype = "mcl_clock:clock"