Detached inventories

doc/lua_api.txt

games/minimal/mods/experimental/init.lua

src/client.cpp

src/client.h

src/clientserver.h

src/guiFormSpecMenu.cpp

src/guiFormSpecMenu.h

src/inventorymanager.cpp

src/inventorymanager.h

src/scriptapi.cpp

src/server.cpp

src/server.h