Tryton GIS backend

It adds GIS support to Tryton.

• Release notes
  • Version 6.8.0 - 2023-05-01
  • Version 6.6.0 - 2022-10-31
  • Version 6.4.0 - 2022-05-02
  • Version 6.2.0 - 2021-11-01
  • Version 6.0.0 - 2021-05-03
  • Version 5.8.0 - 2020-11-02
  • Version 5.6.0 - 2020-05-04
  • Version 5.4.0 - 2019-11-04
  • Version 5.2.0 - 2019-05-06
  • Version 5.0.0 - 2018-10-01
  • Version 4.8.0 - 2018-06-01