Improve task comments

[NicoPennec]

Problem

• On the Task panel, some draft comments don't clear after updating.
• On Task page, the shortcut to copy the "Comment from client" doesn't work.
• When opening a task, the focus is set to the comment field, but with the caret at the beginning.
• On edit and reply comment form, you cannot use the @frame and @department tags (related to not possible to add @frame when editing a comment #897).
• On realtime update between users, the comment update doesn't apply.

Solution

• Rework the way to restore and save draft comments.
• Fix the duplicate comment action.
• Set the focus cursor at the end of the draft comment.
• Harmonize add/edit/reply comment forms to support all tags.
• Update comment on websocket push event