adds initial menu structure
translate library:// folder paths on retrieval rather than when listing
start directory may change after fetch, so update it to the items directory so that navigation out of the window via BACK works as expected
use the path in the items for testing paths after directory fetch
add new menu:// URL format for menu customisation
adds support for switching windows based on menu:// paths from media windows
[WIP:confluence] hack confluence home to use new menu system
WIP: flattening button needs cleanup
Set the item path to the db path for filters