Entirely new version of pull request #3962

Changes to be committed:
	modified:   builtin/game/register.lua
	modified:   src/content_nodemeta.cpp
	modified:   src/content_nodemeta.h
	modified:   src/game.cpp
	modified:   src/inventory.cpp
	modified:   src/inventory.h
	modified:   src/inventorymanager.cpp
	modified:   src/inventorymanager.h
	modified:   src/mapblock.cpp
	modified:   src/network/clientpackethandler.cpp
	modified:   src/nodemetadata.cpp
	modified:   src/nodemetadata.h
	modified:   src/player.cpp
	modified:   src/player.h
	modified:   src/rollback_interface.cpp
	modified:   src/script/common/c_content.cpp
	modified:   src/script/cpp_api/s_inventory.cpp
	modified:   src/script/cpp_api/s_inventory.h
	modified:   src/script/cpp_api/s_nodemeta.cpp
	modified:   src/script/cpp_api/s_nodemeta.h
	modified:   src/script/cpp_api/s_player.cpp
	modified:   src/script/cpp_api/s_player.h
	modified:   src/script/lua_api/l_inventory.cpp
	modified:   src/script/lua_api/l_nodemeta.cpp
	modified:   src/server.cpp
	modified:   src/serverobject.cpp
	modified:   src/unittest/test_inventory.cpp

.gitignore

@@ -85,3 +85,6 @@ build/android/path.cfg
 build/android/and_env
 build/android/AndroidManifest.xml
 timestamp
+
+## Backup files
+*backup.tar.gz