Add mods: technic, moreores, paintings, Nyancat (Pbj_pup). Small fix: sandwiches

mods/xcompat/mtt.lua

@@ -0,0 +1,10 @@
+
+-- emerge a part of the world (basic smoketest)
+mtt.emerge_area({ x=0, y=0, z=0 }, { x=10, y=10, z=10 })
+
+-- check nodelist
+local mtt_nodelist = minetest.settings:get("mtt_nodelist")
+if mtt_nodelist then
+    -- nodelist specified, check if all the required nodes are present
+    mtt.validate_nodenames(minetest.get_modpath("xcompat") .. "/test/nodelist/" .. mtt_nodelist)
+end