Prusa Firmware build environment v1.0.8 for `build.sh`

Update to gnu++17
Update to Arduino_boards 1.0.5-2

Prusa Firmware build environment v1.0.7 for `build.sh`

Updated to Arduino-IDE 1.8.19
Updated to Ardunio_boards 1.0.5

PF-build-env-Linux64-1.0.6.1.zip build environment

Changes from prusa3d/Arduino_Boards#3 have been added.
https://github.com/3d-gussner/PF-build-env-1/releases/tag/1.0.6.1-Linux64

Prusa Firmware build environment version 1.0.6 for WinLin

Activating PF-build-env at prusa3d based on this:
https://github.com/3d-gussner/PF-build-env-1/releases/tag/1.0.6-WinLin

PF-build-env-Linux64-1.0.6.zip build environment

This is an exact copy of mkbel his PF-build-env-Linux64-1.0.6.zip build environment.