Adds the ability to connect/login to an account via the settings and
auto-configuration dialogs. Checks registered Auth objects, and if the
Auth object matches the currently selected service in the settings
window or auto-configuration dialog, will display "connect account"
buttons for the user to be able to click (which are optional, they can
still use stream keys if they'd prefer).
Makes it so that services can have custom handling on a per-service
basis. The bottom part of the service pane is now a stacked widget
which can now be customized for different types of services
(particularly OAuth services).
The "Custom" service has been moved, and is now an item called "Custom"
in the "Services" combo box. This simplifies the stream page of
auto-configuration and removes an unnecessary widget. Overall a minor
but nice slimline/improvement on user experience.
The radio buttons had been changed so "Streaming" would be selected by
default, but it only sets the wizard's "type" to streaming if the user
actually clicks the radio button themselves manually, so it would stay
set to "Invalid" by mistake, causing settings to not be applied.
The auto-configuration wizard is designed to allow first-time or
novice/uneducated users or to set up video and encoding settings in a
very quick and easy way. It'll automatically perform a bandwidth test,
and/or test the user's video settings to determine the most ideal
settings for streaming and recording (assuming a 1-pc setup).
