Fix download atachment widget.
Document_url when activated causes error when opening attachment link on the chatter window
This commit (366676cafd) move download buttons into a sub-component.
I modified the module behavior to use canDownload() method instead of adding a t-if in the view and prevent the chatter component from breaking when the message has attachments.
Define the add attachment and add URL buttons on the same line.
Allow downloading of url type attachments by clicking on the icon or the name.
Define the name of the url type attachments as links (allows to open it in a new tab).
Hide the download button for url attachments.
Force to set mimetype to "application/link" for url attachments.
Displays a link icon for url attachments.
TT30263
Without this patch, when you hover on the menu item, its background color does not change, and its cursor is a text one.
With this patch, the menu item styling matches those available in all surrounding menus.
[MIG] document_url
* bump version to 9.0.1.0.0 and make it installable
* Update JS structure
* Add css in order to be compliant with odoo style
* Add a README.rst and OCA conventions
* Improve selector
* add fr.po for fr translation
* open link with target='_blank'
