* = account, sale
This commit allows users to modify the panel image for the
onboarding steps. This is especially necessary for additional
onboardings that can be/could have been created, or if the
appointment onboarding was modified, as it was chosen to not
overly complicate the upgrade and simply not modify these records.
We also customize the placeholder icon to be one of these icons
instead of the default "camera" image.
Finally, a few icons are renamed to be more generally usable.
closesodoo/odoo#121349
Related: odoo/enterprise#41031
Signed-off-by: Thibault Delavallee (tde) <tde@openerp.com>