Log non-fatal mod name conflict to actionstream instead of errorstream
Fix disappearing of wielditem
Make raillike nodes connect to any other raillike nodes if both are in the group connect_to_raillike
Predict param2 of facedir nodes and attachment of attached_node nodes
Move scriptapi to separate folder (by sapier)

On the lua side, notably minetest.env:<function>(<args>) should now
be replaced by minetest.<function>(<args>).
The old way is and will stay supported for a long time.

Also:
Update and clean up lua_api.txt (by celeron55)
Move EnvRef to lua and remove add_rat and add_firefly (by kahrl)
Add separate src/util/CMakeLists.txt, other minor fixes (by kahrl)
Fix itemstack:add item not working correct
Higher resolution menuheader
Add ObjectRef.hud_set_hotbar_itemcount and add TOCLIENT_HUD_SET_PARAM
Fixed wrongly named invref:get_location() table members for nodes.

Makes the result compatible with the minetest.get_inventory(location) param.
Bugfix: Update formname on showing new formspec while already one shown