Overhaul the device list in the "Security and Privacy" settings tab to include device trust status, provide buttons for verifying unverified devices, and improve overall usability and style. This should now be the primary interface for checking and changing the trust status of your own devices, rather than looking at your own user profile in the right panel.
And also a bunch of other UI fixes in the devices table:
* It's the devices table, don't need 'device' in all the headers
* Not really necessary to label checkboxes with 'select'
* Stop table from moving down when the delete button appears
Fixes https://github.com/vector-im/riot-web/issues/10216
