SAPI: Mark all Lua API functions requiring envlock

src/script/lua_api/l_env.cpp

src/script/lua_api/l_internal.h

src/script/lua_api/l_inventory.cpp

src/script/lua_api/l_mapgen.cpp

src/script/lua_api/l_nodemeta.cpp

src/script/lua_api/l_nodetimer.cpp

src/script/lua_api/l_noise.cpp

src/script/lua_api/l_object.cpp

src/script/lua_api/l_particles.cpp

src/script/lua_api/l_rollback.cpp

src/script/lua_api/l_server.cpp

src/script/lua_api/l_util.cpp

src/script/lua_api/l_vmanip.cpp