Develop and use a custom-control in an external library

Hi,

I developed  custom SAPUI5-controls which I want to use in multiple applications. Therefore I would like to develop them in a separate entity ("library") and only reference it in my applications. So my questions are

How do I setup a library "project" in the WEB-IDE? Is this possible at all? I could setup a dummy "application" which only contains the controls and deploy it as usual to a BSP, but how do I reference the the contents of the project from other applications? It is important that the reference is relative, since I want the components to be loaded from the same stage (dev, qs, production) as the relevant application.

Thanks for any ideas regarding this issue!

Bernhard