Remove liquid_finite and weather

builtin/mainmenu.lua

doc/lua_api.txt

minetest.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/mapgen.cpp

src/script/lua_api/l_env.cpp

src/script/lua_api/l_env.h

src/serverlist.cpp