Modulr makes cases designed to work with a wide range of its accessories, and the Mini Mobility Pack for iPad mini ($60) is no different. The core of the pack is a plastic and rubber case, which is squared off rather than matching the curved edges of the tablet. Billed as "the world's thinnest shock proof case," it includes button and side switch protection. Also included is a cover, which can snap on to the front of back of the case depending on…