various improvements

[EvanBldy]

Problem

• Some requirements are outdated.
• For the breakdown when you use shared assets (from another project) they are not ready.
• There is a missing import.
• For the routes: "data/comments" and "data/projects/<project_id>/comments" it's only possible to get all comments for a project when you are a studio manager.

Solution

• Upgrade outdated requirements.
• For the breakdown when you use shared assets (from another project) always set them as ready.
• Fix missing import.
• For the routes: "data/comments" and "data/projects/<project_id>/comments" allow to get all comments for a project when you are a manager, supervisor, or artist (only if they have access to that project).