Merge pull request #147 from PrzemekSzyszka/windows_phone

[WP] URBNG-134 Account management
URBNG-519 - [WP] Implement queue of toast notifications
also:
* fixed TaskView header
* disabled back button while sending solution
* deleting old solutions - only the latest is stored in db
Merge pull request #149 from PrzemekSzyszka/windows_phone

[WP] URBNG-513 implement initial sync for user who already has his account
URBNG-514[ WP]implement possible answers listso player can select correct options
Merge pull request #151 from PrzemekSzyszka/windows_phone

[WP] Password recovery
Merge branch 'windows_phone' of github.com:blstream/UrbanGame into windows_phone

Conflicts:
	UrbanGameWP7/UrbanGame/ViewModels/TaskViewModel.cs
Merge branch 'windows_phone' of github.com:blstream/UrbanGame into windows_phone
URBNG-514[WP]implement possible answers list so player can select correct options - added handling for delayed solution's result delivery
Merge pull request #153 from adamwalocha/windows_phone

 	URBNG-514[ WP]implement possible answers listso player can select correct options
Merge remote-tracking branch 'remotes/main/windows_phone' into windows_phone

Conflicts:
	UrbanGameWP7/UrbanGame/ViewModels/TaskViewModel.cs
	UrbanGameWP7/UrbanGame/Views/TaskView.xaml
Merge pull request #150 from Maxikq/windows_phone

URBNG-519 - [WP] Implement queue of toast notifications
[WP] URBNG-540 No "repeatable / not repeatable" indicators are present on task details view
+ Fix merge conflicts