* from collections import <ABC> is deprecated, unclear why the
  deprecation warning didn't appear before (possibly only appears in
  3.7/3.8?) either way `collections.abc` should be 3.3+ so switch
  everything to it.
* add some more ignores on third-party packages deprecation
  warnings (meh)
* while at it, mitigate generation of non-breaking space on some
  versions of Babel (in the french locale used by our tests anyway)

closes odoo/odoo#47581

Related: odoo/enterprise#9214
Signed-off-by: Xavier Morel (xmo) <xmo@odoo.com>

load_lang was a kind of hybrid method trying to active or creating a
language if not found. This was error prone.
Instead rely on two methods with clear purpose:
ResLang._create_lang(lang, lang_name=None)
  - create a new res.lang entry using the locale of the server
    return the res.lang record to match the API of _activate_lang

ResLang._active_lang(code)
  - activate the given code lang

Most of the time, _active_lang is what is expected

tools.trans_load_data and IrTranslation._load_module_terms no longer
activate the language if not active.
Loading the translations should be explicit on an activated language,
it is too error prone to silently activate/create a language if not
found.
Remove lang_name from trans_load_data as no longer needed.

closes odoo/odoo#29039

The option `digital` has been added. It allows to display "01:00" instead of "1
hour". This behaviour was implemented in a report (timesheet) but the logic
was done in the XML, which is not adequate.

This commit also allows to have a negative value for this widget.

* StringIO removed from stdlib, replace with io
* try to correctly handle BytesIO/StringIO (one is for bytes the other
  is for text)
* fix base64: Python 3 removed bytes-encoding and bytes-bytes
  codecs (via #encode) so replace all calls to str.encode('base64'),
  also b64encode is a bytes->bytes conversion so attempt to properly
  handle that

issue #8530