Orion/Documentation/Developer Guide/Plugging into the settings page
Orion plugins can define settings. A setting defines some persistent information that is provided to one of the plugins's services. Defined settings appear on Orion's Settings page, and their values can be changed using an automatically-generated UI. Each setting has a unique identifier called a PID, along with metatype information that gives the properties that may appear in the setting and their data types.
Contributes a setting.