Add observer dummy block

mods/redstone/mcl_observers/depends.txt

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+mesecons
+mcl_util

mods/redstone/mcl_observers/init.lua

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+minetest.register_node("mcl_observers:observer", {
+	description = "Observer (WIP)",
+	is_ground_content = false,
+	sounds = mcl_sounds.node_sound_stone_defaults(),
+	paramtype2 = "facedir",
+	-- TODO: Add to craft guide and creative inventory when it's useful
+	groups = { cracky=2, not_in_craft_guide=1, not_in_creative_inventory=1 },
+	tiles = {
+		"mcl_observers_observer_top.png", "default_furnace_bottom.png",
+		"mcl_observers_observer_side.png", "mcl_observers_observer_side.png",
+		"mcl_observers_observer_front.png", "mcl_observers_observer_back.png",
+	},
+	after_dig_node = function(pos, oldnode, oldmetadata, digger)
+		local meta = minetest.get_meta(pos)
+		local meta2 = meta
+		meta:from_table(oldmetadata)
+		local inv = meta:get_inventory()
+		for i=1, inv:get_size("main") do
+			local stack = inv:get_stack("main", i)
+			if not stack:is_empty() then
+				local p = {x=pos.x+math.random(0, 10)/10-0.5, y=pos.y, z=pos.z+math.random(0, 10)/10-0.5}
+				minetest.add_item(p, stack)
+			end
+		end
+		meta:from_table(meta2:to_table())
+	end,
+	-- TODO: Mesecons handling
+	mesecons = {effector = {
+	}}
+})
+
+minetest.register_craft({
+	output = "mcl_observers:observer",
+	recipe = {
+		{ "mcl_core:cobble", "mcl_core:cobble", "mcl_core:cobble" },
+		{ "mcl_nether:quartz", "mesecons:redstone", "mesecons:redstone" },
+		{ "mcl_core:cobble", "mcl_core:cobble", "mcl_core:cobble" },
+	}
+})
+minetest.register_craft({
+	output = "mcl_observers:observer",
+	recipe = {
+		{ "mcl_core:cobble", "mcl_core:cobble", "mcl_core:cobble" },
+		{ "mesecons:redstone", "mesecons:redstone", "mcl_nether:quartz" },
+		{ "mcl_core:cobble", "mcl_core:cobble", "mcl_core:cobble" },
+	}
+})
+