Fix spelling of trigonometric function names in examples

Changelog: add entry for PR #103: fix handling of border.rectList wit…

…h PySide6 backend

Update CHANGELOG for version 0.14.5

Replace QRect with QRectF for improved precision in CPU demo test

Update README.md to use QtPy for QApplication initialization

Bump version to 0.14.1

Fixed random crashes (segfaults) on Linux related to Qt objects store…

…d in cache data