New Synchronet File Manager (run using jsexec)

This is a new TUI-style filebase browser/editor for sysop use. Sysops can
search files, descriptions/metadata, uploader names, offline files and then
easily remove/delete or edit those file's names, description, uploader.

Ideas for improvements (e.g. file tagging/bulk deleting) may require updates
to UIFC. This is a proof of concept at least and provides some functionality
already.