pyqt5 support and raspberry#3

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Mte90 wants to merge 7 commits intomlisbit:masterfrom

Commits on Nov 28, 2018

pyqt5 support
Mte90
authored

Commits on Oct 31, 2019

code optimized and reorganized
Mte90
committed

Commits on Nov 8, 2019

fixes
Mte90
committed

Commits on Nov 16, 2019

added explantion comments
Mte90
committed

Commits on Nov 24, 2019

use ptyhon3
Mte90
committed

Commits on Dec 9, 2019