Add support for sticky blocks for pistons and a a sample sticky block

mesecons_stickyblocks/depends.txt

@@ -0,0 +1,2 @@
+mesecons
+mesecons_mvps

mesecons_stickyblocks/init.lua

@@ -0,0 +1,16 @@
+-- Sticky blocks can be used together with pistons or movestones to push / pull
+-- structures that are "glued" together using sticky blocks
+
+-- All sides sticky block
+minetest.register_node("mesecons_stickyblocks:sticky_block_all", {
+	description = "All-sides sticky block",
+	tiles = {"default_grass_footsteps.png"},
+	groups = {dig_immediate=2},
+	mvps_sticky = function (pos, node)
+		local connected = {}
+		for _, r in ipairs(mesecon.rules.alldirs) do
+			table.insert(connected, vector.add(pos, r))
+		end
+		return connected
+	end
+})