[MERGE] *_timesheet: selling services improvements

Impacted modules: account, hr_timesheet, sale and sale_timesheet

This merge commit contains many small changes in the way we
sell time in odoo.

* amount to invoice/invoiced amount: change the simple formula
used to really takes amount on invoice into account. This reintroduces
the 2 fields on sale.order.line model.

* some usability improvements: styling project overview, better
error and warning messages, ...

* invoicing timesheet: only timesheet linked to sale line with
'delivered qty' product will be linked to the invoiced (and considered
as invoiced) at invoice creation (instead of validation). Those
timesheets can not be modified then.

* Previous change implies to remove timesheet_revenue, which
became useless.

For more details, have a look at subcommit, as they explain
more precisely their feature and purpose.

Thanks to @bst-odoo for his support and functionnal coaching.

Task #1857652

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