Summary

Drop support for python 2

Rationale

Python 2 has been sentenced to dropped support

Implementation Details

All references to python2 have been removed.  The variable is now : *_PYTHON which refers to python3.

Remote Module

All remote modules are removed from the build as they bring issues not related to this MR.

Documentation

Documentation is updated.

Copyright

The copyright owner is CNES and has signed the ORFEO ToolBox Contributor License Agreement.

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Check before merging:

• All discussions are resolved
• At least 2 👍 votes from core developers, no 👎 vote.
• The feature branch is (reasonably) up-to-date with the base branch
• Dashboard is green
• Copyright owner has signed the ORFEO ToolBox Contributor License Agreement