Migrated most of the application state to the server

This release represents a significant rewrite of the handling of the application state, most of which is now handled by the server. As a side effect, the migrated state is now under configuration control and can be stored in user configuration files. The restoration of the state is included in this release; an upcoming release will enable interactive selection of which aspects of the configuration state to persist.

A few issues, both bugs and enhancements, were also addressed: #7, #17, #19, #27, #28, #29, #34, #50, #53, #54, and #57.

What's Changed

• Restructured the way the live cursor location information is harvested and rendered by @aivazis in #49
• Simplify connecting new dataset from an archive by @aivazis in #50
• The app is now more accessible from the command line by @aivazis in #54
• Migrated most of the client state to the server by @aivazis in #62

Full Changelog: v0.9.2...v0.9.3