Skip login type selection when logging in via intent (#1267)

* Move companion object to the end of class

* Skip login type selection when logging in via intent

* Skip login type page if not default login type

* Add test for implicit email intent

* Fix test

* Update KDoc

* Refactor URI handling in LoginActivity and StandardLoginTypesProvider

* Skip login type page if intent is clear, but don't skip when using defaultLoginType

* Log unclear intents

* Use data class instead of pair

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Co-authored-by: Ricki Hirner <hirner@bitfire.at>