Various improvements

[frankrousseau]

Problem

• There is no way to check if the DB is initialized via the command line.
• Some TV Paint extensions are missing
• It's not possible to update shots via the shots/shot_id route
• Some routes are non accessible to non-admin users while there is no functional reason for that: /entities and projects/poject_id/tasks
• projects/poject_id/tasks cannot be filtered by episode

Solution

• Add a is-db-ready command to the CLI to check if the DB was initialized.
• Add TV Paint extensions
• Allow to update shots via PUT requests on the shots/shot_id route
• Open access to /entities and projects/poject_id/tasks by filtering on project teams (assigned tasks for vendors)
• Allow to filter tasks from projects/poject_id/tasks via an episode_id parameter
• Allow to filter tasks from tasks via an episode_id parameter

[EvanBldy]

Thanks !