Need a moduleParameter type (based on an array) that specifies the sharing of a component class

[Ken McLean]

Need a moduleParameter type (based on an array) that specifies the sharing of a component class. This will require the get self component path, and appending this into the array so that modules can check if they have access to a component class, and then call it.

Because of the fixed paths, retromod needs to run a check to see if a class-sharing component has changed it's fixed path, and display as a $system_message, as per bug #326474