Dashboard rights

[Juyoo]

Subject of the issue

Create dashboard rights (Super User / Owners / User)
Put the creator as Super user
When a user is added to a dashboard add him as User, then let Super user and owners change user rights.

Implementation :

1. Create a new table "project_roles" that hold the 3 needed roles (Super user, Owner, User)
2. Create a reference table with User, project_role, project as PK

Role definitions :

1. Super user : Can manage everything on the dashbaord (edit, add/delete user, manage user roles, manage widgets, delete dashboard)
2. Owner : Can do the same except delete the dashboard
3. User : can only manage the widgets

Issue type

[] Bug
[] Improvment
[] Documentation
[x] Feature

[yodamad]

@Juyoo Already done ?

[Juyoo]

Not done already.
At the moment every users added to a dashboard have the same rights