add button to invalidate browser sessions/device tokens

lib/private/Authentication/Token/DefaultToken.php

lib/private/Authentication/Token/DefaultTokenMapper.php

lib/private/Authentication/Token/DefaultTokenProvider.php

lib/private/Authentication/Token/IProvider.php

lib/private/Authentication/Token/IToken.php

settings/Controller/AuthSettingsController.php

settings/css/settings.css

settings/js/authtoken_collection.js

settings/js/authtoken_view.js

settings/templates/personal.php

tests/lib/Authentication/Token/DefaultTokenMapperTest.php

tests/lib/Authentication/Token/DefaultTokenProviderTest.php

tests/settings/controller/AuthSettingsControllerTest.php