* [#1417] Add authentication
- Closes#1417
- Closes#326
- Partially addresses [Electric-Coin-Company/zashi#7] too
- Creates reusable AuthenticationVM component with all necessary logic that reports authentication status to its callers
- Addresses authentication requirements for the Send funds, Delete wallet, Export private data, and Recovery phrase. The App access authentication use case is prepared and can be turned on anytime.
- The new logic also counts with possible future user customization via the app UI of the default on/off states for all implemented authentication use cases
- Send.Confirmation logic simplification
- This also adds the welcome screen (splash) animation to all the app entry points (the app recreation caused by system included)
* Allow unauthenticated access
- In case no authentication method is available on the device
* Build supported authenticators for the device
- Based on the device Android SDK version
* Disable broken screenshot testing
- This is a temporary change until #1448 is addressed
* Changelog update
* Add temporary placeholder screenshot test
To suppress no test error
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