User settings: contact address and user profile picture

The contact address shows all contact-relevant details of the user.

	If the users are managed in UCServer, the users can be given the right to enter or update the details and add a user picture. Otherwise, this information is only displayed for the user to check and cannot be changed.
	A user image is displayed in various places in estos ProCall. These are visible for both server users and federation contacts (depending on the authorization) and the user image is scaled without distortion when it is added or loaded.