Pycinema

Updates for linked selection

Updated application framework, linked selection sets, 'discover' application and other changes.

See pycinema.readthedocs.io for full update information.

Major release of pycinema toolkit, including:

- Cinema:Theater, an application for building, editing and saving pycinema filter graphs and applications
- Cinema:View and Cinema:Explorer workspaces, which can be used to view Cinema databases
- Updated and streamlined filter architecture, to simplify the process of writing new filters

Updated release, including:

1. Multi-database browser
2. Updated setup, make and release support

Initial release of the pycinema toolkit