Svg-turtle

Adds IPython integration, and switches to pyproject.toml.

**Full Changelog**: https://github.com/donkirkby/svg-turtle/compare/v0.4.3...v1.0.0

Fixes 37, a problem with the layering of filled polygons.

This release is mostly to show support for Python 3.11 and 3.12, but it also stops using a clip path to clip to the requested canvas size. It was causing some problems with recent versions of PyCairo.

Fixes 7.

Fix 3 to support macOS.

Fixes 2 by restoring pen state after `dot()` calls. Also includes some fixes for colour handling.