When enabled, AutoRedirectToProvider will switch authentication challenges to redirect to the external auth provider instead of displaying the password login form. If more than one external provider is configured, a minimal external auth provider login page will be shown.
Ref #410
Settings for the server are now combined with the settings from the SDK. This introduces a large breaking change and a migration should be created. This refactor utilizes .NET Configuration and the Options pattern. This will allow for the overriding of any setting using envionment variables. It also means that Settings.yml can be used to override any .NET configuration. A SettingsProvider implementation was created, and any updating of settings was changed from SettingsService.SaveSettings() to SettingsProvider.Update(s => { ... })
