Wallet backups in the Android app - design iteration 2

Based on the feedback collected by email and during the design review session
on 30 August, I've made the following changes to the design of the wallet
backups:

* The things that kind of look like snackbars are snackbars! As in
https://material.io/components/snackbars They may look somehow different
because these are not real Android components, but just a Google-provided
stencil for Figma (https://www.figma.com/community/file/778763161265841481).

* In the top "Settings" screen, I have added a list item for the auditors.

* In the "Configure wallet backup" screen, I have added a "Back up to a
file" option

* In the "Configure wallet backup" screen, the main action no longer says
"Create backup", but "Pay and start backup".

* In the "Configure wallet backup" and "Change backup provider" screens,
I have added some information about how all Taler backups are encrypted,
including the files created when you back up to a file.

* In the "Configure wallet backup" screen, I have added the annual fee
and the storage limit.

* In the "Configure wallet backup" screen, users are now prompted to pay.
The design uses a modal dialog to ensure people know what they are paying for.

* All references to backup "locations" have been removed, and replaced with
"backup provider".

* The process of changing backup providers now involves a disabled "Save"
button until a valid provider URI is entered. Some help text explains that
valid provider URIs end with a "/". The design also shows how to handle
error messages.

* After paying the backup annual fee, the process now lands users directly
on the "Recovery credentials" screen, without any intermediate steps and
no modal dialog. Users can of course leave this screen without saving
their recovery credentials, but hopefully the design provides a strong
incentive to view and save those credentials.

* The "Recovery credentials" screen now includes a reference to
Anastasis and a link to https://anastasis.lu

* The "Recovery credentials" screen now includes 3 ways of handling the
recovery credentials: as text, as a QR code and with Anastasis.

* The text and QR code credentials screens now include a "Test your credentials"
option, that people can use to verify their credentials URI or their QR code.
This testing option is available for the text and QR code options, but not
for the Anastasis one, since it would incur a cost.

* The text and QR code credentials screens now include a reminder that people
should keep their credentials private.

* The text credentials screen provides an option to copy to clipboard. Copying
triggers a dialog notifying users that the credentials URI will be copied
in plain text.

* The QR code credentials screen now includes an option to print the QR code
and an option to copy to clipboard.

* Access to the "Recovery credentials" screen from the Settings now requires
people to unlock the device.

* The "Wallet backup" settings screen now includes an option to activate
automatic synchronisation ("Automatic backups").

* The "Backup provider and fees" settings screen now includes the fee paid,
the storage used and the storage limit, the backup expiry date, the backup
renewal fee, an option to turn on auto-renewal, and an option to change
the backup provider.

The video explains the new design.

Screens created with Figma and available at:

https://www.figma.com/file/I0L3WcvRKLTPLU6MNmKUhp/Taler-Wallet-Anastasis
-integration?node-id=569%3A324

Clickable prototype available at:

https://www.figma.com/proto/I0L3WcvRKLTPLU6MNmKUhp/Taler-Wallet-Anastasis
-integration?node-id=569%3A324&scaling=min-zoom&page-id=557%3A2957&
starting-point-node-id=569%3A324

Signed-off-by: Belen <belenbarrospena@gmail.com>

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