PlatformIO Python interpreter break hooks with PYTHONPATH inconsistency

[prothen]

• PYTHONPATH in PlatformIO expects not using external environment in hooks (possibly a clash with ROS melodic distro using Python2.7)

Possible alleviations:

• Possible to transition to penv only for conformance
• Dropping Python2.7 support and ROS melodic -> ROS noetic
• Intermediate solution using PYTHONPATH filtration using hook_middleware.py