JSON metadata conversion: support repeated columns

refs #6266
Enable viewing disabled processing config options

In the processing config GUI, allow all dropdowns to be modified,
regardless of whether or not they are active.  This allows the user to
see what the options are, without having to enable them first.
Remove deprecated storage config JS
Remove dead API code
Remove unused client scripts

Remove client scripts and entries in archivematicaClientModules for
scripts that do not appear in database and are never imported in
codebase.  Remove client scripts that are not listed as a client
modules and never imported.
Fix transfer/ingest URL regex

Add '^' to the beginning of ingest & transfer URL patterns. Transfer and
ingest URL regexes should match from the beginning of the line, otherwise
any string of characters followed by 'transfer/' will direct to the
transfers page.  This can incorrectly match things like api/transfer.