Add configuration for default UI view type.
Add new configuration to config API endpoint.
Update getUserPreferences to obtain config for setting default value for input output view mode, forcing it to be async and updating all references to await and to become async also.
Add test to ensure config is adhered to, by setting system wide config and ensuring the pages display as expected.
Update name of user preference to be more generic, allowing it to be used for more than input/outputs tabs in future

Issue #527