Directory navigation support

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Now that the project vision and software architecture has aligned via implementation, its time to expand the scope of the project.

• To this end the best direction appears to be embracing sequentially consumed content including books, video, and to a lesser extent music
• A common theme between all of them is directory navigation
• Note this is not a departure from the mono-collection philosophy, but rather creating a familiar analog for one of its core concepts, "groups"
  • A group is just strings of ordered files with no prescription as to what they represent
  • A group could contain pages of a book, episodes of a show, acts in a movie, etc
  • Outside of a group no ordering is guaranteed, which is where attributes begin to be important again and it becomes the viewer's responsibility to implement filtering where applicable
  • This flat hierarchy combined with attributes based filtering is where mono-collection derives its anti-occlusion capabilities and it is a strength we should play into