Break up SharedModule into smaller, specific pieces

[andrewatwood]

The SharedModule is a bit of a catch-all right now and can probably be pared down quite a bit. Care was taken elsewhere to organize modules by features but SharedModule didn't get quite as much love on that front and covers a lot of ground: thumbnails, forms, pipes, components for common Dialogs, etc.

These can all be split into more logically organized modules, and imported more deliberately by any dependent modules. Since lazy-loading is configured for routed modules, this may help cut down bundle size, as well as just generally organizing things.