In this commit, we will convert all the customisations of the list view consist in adding an always present button in the control panel that performs an action/calls a model's method. To do this, we will use the new display="always" parameter applicable to buttons in the header of list views. This allows us to define a button that is always visible in a list view. closes odoo/odoo#106519 Taskid: 3082303 Related: odoo/enterprise#34387 Related: odoo/documentation#3044 Signed-off-by: Aaron Bohy (aab) <aab@odoo.com>