Remove liquid_finite and weather
Fix warnings
Merge remote-tracking branch 'minetest/master'

Conflicts:
	builtin/mainmenu.lua
	freeminer.conf.example
	src/biome.cpp
	src/constants.h
	src/content_abm.cpp
	src/defaultsettings.cpp
	src/environment.cpp
	src/environment.h
	src/game.cpp
	src/map.cpp
	src/map.h
	src/mapblock.cpp
	src/mapblock.h
	src/script/lua_api/l_env.cpp
	src/script/lua_api/l_env.h