…, when opening from Boxer app. View disappeared after the biometrical unlock succeeded. Probably because 'completeRequest' was sent from the biometrical unlock extension, which caused a dismiss in the share sheet extension.

…share sheet

- share unlock and last application background date via app and extensions

…L schemes from the app bundle

- UIViewController+HostBundleID: category to return the bundle ID of the app hosting/invoking a (share) extension
- ShareNavigationController: set OCAppIdentity.hostAppBundleIdentifier using UIViewController+HostBundleID
- AppLockSettings:
	- replace "use-biometrical-unlock-share-sheet" boolean with "share-sheet-biometrical-unlock-by-app" dictionary
	- implement new logic to turn off biometric authentication based on share sheet invoking app
- AppLockManager:
	- make LAContext() optional throughout methods
	- move invocation of openURL to central place
	- remove fixed URL opening of owncloud:// and replace it with the dynamically composed URL AppLockSettings.biometricalAuthenticationRedirectionTargetURL
- PasscodeViewController: rename cancelButtonHidden to cancelButtonAvailable because the latter is what it actually does
- ownCloud Share Extension/Info.plist: add missing OCAppComponentIdentifier key so that OCAppIdentity.componentIdentifier returns the correct value