Add chests, the beginnings of a machines API, and other things

mods/rgt_towns/rgt_towns_core/plots.lua

@@ -224,6 +224,11 @@ function ns.place_plot(grid, pos, plot, owner, rot)
     
     local def = ns.plots[plot]
     
+    -- Erase all preexisting node metadata.
+    for _, pos in ipairs(minetest.find_nodes_with_meta(box.min, box.max)) do
+        minetest.remove_node(pos)
+    end
+    
     minetest.place_schematic(dst, def.schematic, rot, repl, true, {})
     
     local p, gp, m