update examples/generic_memtest.py

add examples/generic_memtest.py

bump 0.35

state: fix releasing listener for destroyed views

keep PUINode.children iterable after destroyed

pyside6: signal reconnection and cleanup

PySide6.Label: replace signal connection

fix resource management issues

release callbacks in destroy()

release resources in destroy()

bump 0.34

PySide6.Canvas.drawShapely: use OddEvenFill instead of QPainterPath.subtracted()

bump 0.33

PySide6.Canvas.drawShapely: add cache to prevent expensive QPainterPath.subtracted()

bump 0.32