The huge item definition and item namespace unification patch (itemdef), see http://c55.me/minetest/wiki/doku.php?id=changes:itemdef

Make global names in default mod use good naming convention and move backwards-compatibility definitions to mods/legacy

inventorycube: use all three specified textures; also moved mesh creation / modification functions to mesh.cpp; in lua, inventorycube is now called minetest.inventorycube

Create the necessary API for /giveme and /give and implement those commands; also sort out the scripts a bit