Clean Code: Apply flake8-simplify to Python

Also flake8-comprehensions which was added to the CI

For flake8-simplify, there are a few false-positives,
e.g. https://github.com/MartinThoma/flake8-simplify/issues/115

88_3-D_Tic-Tac-Toe/python/qubit.py

@@ -368,9 +368,8 @@ class Qubit:
             ]
 
             while True:
-                if not skipHuman:
-                    if not self.humanMove(board):
-                        break
+                if not skipHuman and not self.humanMove(board):
+                    break
                 skipHuman = False
 
                 m = board.machineMove()