Qt 6 for Python released

Qt 6 for Python is released. In this release, PySide6 and Shiboken6 updates are also included.

Major updates include:

• Support Python 3.9, and increase the minimum supported version to 3.6.
• Execute "Python 2 exorcism" in the code base and delete the deprecated version of the language.
• Users can use some of the outstanding features of the Python language, such as f string, underline numbers and text, variable comment syntax, etc.
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PySide6 ：

• PySide was originally released for Qt 4, and PySide 2 was released for Qt 5.12. This version follows the general Qt release version number.
• Qt 6.0 supports accessing Qt attributes directly from Python code, without using setters and getters to use new  true_property features. 

Shiboken6:

• Removed unused functions.
• Rebuild internal processes, such as interaction with ApiExtractor or CppGenerator.
• For binding generation, more options are added to the type system, such as allowing the selection of the order of function overloading to be used in subroutines.
• In C++'s support for binding generation, the interaction with smart pointers has been improved.

Update details: https://www.qt.io/blog/qt-for-python-6-released