Added a dictionary where additional user rights can be set.
A plugin such as the DigitalFactory can update this dictionary
if certain account rights change. The `account.additionalRights`
is intended to allow us some flexibility, without breaking the API
in the future.
The Application Switcher now queries the additional account rights,
which is updated by the DF plugin to only show `My printers`,
`Digital Library` and `Print jobs` when the user has access to the
DF.
Contributes to CURA-8624
Some links in the application only make sense to
forward a user when they are logged into the DF.
Since we don't expose yet if the user has access
to the DF it will now only check if they are
logged in.
Contributes to CURA-8624
