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Try starting the WifiP2p framework multiple times with delay if BUSY

See merge request !15

* Improve HotspotManager logging (attempt count)
* Add layout margin for status text
* Fix wording in inner documentation
* Remove unneeded LOG field
* Remove flag 'startRequested'
* Move Javadocs within HotspotManager

Instead of relying on the ConditionManager making sure that WifiP2p is
really ready to be used, just try starting the framework as soon as Wifi
is enabled and retry for 5 seconds until it either works or fails.

Achieve this by moving ActivityResultLauncher initialization into the
ConditionManager implementations, relieving HotspotFragment from
managing the interaction of the retrieved results and calling the right
methods in the ConditionManager, thereby encapsulating more of the
condition management in there.

* Create an interface called ConditionManager that the 28 and 29
  versions implement
* On API levels < 29, don't ask for the location permission
* Simplify ConditionManager logic:
  * Make more concise what areEssentialPermissionsGranted() and
    checkAndRequestConditions() do and get rid of startConditionChecks()
    entirely; use checkAndRequestConditions() instead.
  * Now areEssentialPermissionsGranted() is a private method only used
    internaly by the ConditionManager implementations

Do not fail when group is null and no attempts left to retry

See merge request !14

Do not increment the attempt variable twice when requesting group info

See merge request !11

Check if peer has connected

See merge request !10

Use HTML template to render designed website

Closes briar#2022

See merge request !9

ViewModel cleanup

See merge request !6

and add some thread annotations