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)

Make raillike nodes connect to any other raillike nodes if both are in the group connect_to_raillike

Mods are placed in $path_<user/share>/mods
They can be enabled per world in world.mt or the configure world window

Add a Way of checking for specific Feature with Lua Adds minetest.get_feature() and minetest.has_feature()

Fix health bar overlap when a larger texture is used

Improvements to get_all_craft_recipes (see api doc)

Spawn single particles or make use of ParticleSpawner for many randomly spawned particles.
Accessible in Lua using minetest.spawn_particle and minetest.add_particlespawner.
Increase Protocol Version to 17.

Conflicts:
	src/clientserver.h