Add PyQt6 and PySide6 support

[MichaelClerx]

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• DataBlockViewer

[MichaelClerx]

Probably also a good time to drop PyQt4 and PySide support.

Wikipedia says 5 was released in 2012, and support for 4 ended in 2015. Myokit deprecated Qt4 and PySide use in september 2019.

[MichaelClerx]

PyQt6 uses exec as a function name, which causes a syntax error in Python 2
So unless we want to have some file that renames it exec_ that we import from only on PySide6, this might have to wait until we drop Python2 ?

[MichaelClerx]

PyQt6 uses exec as a function name, which causes a syntax error in Python 2 So unless we want to have some file that renames it exec_ that we import from only on PySide6, this might have to wait until we drop Python2 ?

Done 😁

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (3b698bb) 100.00% compared to head (8f7be74) 100.00%.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #979   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          101       101           
  Lines        20406     20406           
=========================================
  Hits         20406     20406           

Impacted Files	Coverage Δ
myokit/__init__.py	100.00% <100.00%> (ø)
myokit/_config.py	100.00% <100.00%> (ø)
myokit/_system.py	100.00% <100.00%> (ø)

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