Purpose is to avoid having void images in the systray when there are
notifications linked to products. Solving that issue require to put an
icon on the product module. The old one that was badly named is replaced
by a new one more in line with Odoo guidelines.
This commit is linked to task ID 48228.
* This commit adds an easy access to products and variants from the app switcher / root menu, similar to what exists for contacts.
* Move an action to view stockable products to stock, as it is only executed from stock.