Brazilian Localization Account Fleet

This module inserts the following snippet below into the form view of
the invoice_line_ids field:

``` xml
<xpath
    expr="//field[@name='invoice_line_ids']/form/sheet/group/field[@name='account_id']"
    position="after"
>
    <field name='need_vehicle' invisible='1' />
    <field
        name='vehicle_id'
        attrs="{'required': [('need_vehicle', '=', True), ('parent.move_type', 'in', ('in_invoice', 'in_refund'))], 'column_invisible': [('parent.move_type', 'not in', ('in_invoice', 'in_refund'))]}"
    />
</xpath>
```

This implementation is necessary because, by default, invoice lines are
added directly in the tree view. However, in the case of Brazilian
localization, the inclusion of invoice lines is done through the form
view. Therefore, the account_fleet module adds the necessary fields for
integration between the accounting and fleet modules, specifically in
the tree view of the invoice_line_ids field. Additionally, this module
adds the same fields in the form view of the invoice lines. With this,
the integration between accounting and the fleet module occurs
seamlessly.