As a User, I want to set my own default views with specific UI layout so I can tailor my Viewer experience to the activities I'm most interested in.

This is an opportunity to create Viewer "modes" or custom layouts for specific activities like builder, scripter, social, explore, photographer, etc.

Note:

• We'll want to ship with some default modes
• We need separate modes for separate accounts (per machine, per user)
• A current limitation of this story is that it's hard for us to create new asset types so it's hard to store and save file formats on the server. So the files associated with saved layouts will be LLSD text files, so you can email or paste layouts into a notecard to share with other users, but we can't provide support for automatic sharing between users at this time.