- Impacted modules: 
    - project_todo (new module) 
    - note (deleted module) 
    - project
    - mail (test adaptation)
    - test_discuss_full (test adaptation)

- Changes summary: The application Notes is removed and replaced by a
new app To-do. This new app is based on the model project.task and other
related models, allowing to have a nice link with project. To-dos are
actually private task that are displayed in both Project and To-do
app. The reason why To-do could be used is that it introduces clean
views and simplified widgets to work on these tasks/to-dos.


- Commits description:
    - ***[ADD] todo, note,...: replace Notes with To-do***: Deprecation
    of Notes and create of To-do (module project_todo). The model
    project.task is slightly modified to be able to be used in the
    module project_todo (mainly security and personal stages management
    methods). Views and activities are adapted to the new model.
    - ***[IMP] todo: make the name of a to-do editable from the
    breadcrumbs***: The name of a To-do is made editable directly in the
    breadcrumbs.
    - ***[IMP] todo: add conversion form for todo->task***: A new action
    is introduced in To-do to be able to convert a to-do to a task in a
    project.
    - ***[IMP] todo,...: add an onboarding to-do***:  An onboarding to-do
    is added to describe the functionalities of the new app to the
    users.
    - ***[IMP] project: avoid to add OdooBot as default assignee on
    tasks***: Improvement of the UX for both Project and To-do.
    - ***[IMP] todo: integrate mark as done in To-do app***: This commit
    introduces a new widget in To-do that can be used to set a to-do as
    done. This widget used the new states recently introduced in Project
    but present them in a simplified binary value in To-do.
    - ***[MOV] project_todo: rename module todo to project_todo***:
    Technical renaming to avoid confusion.
    - ***[REM] note,...: remove module note***: Removing of module note.

task-3085077