Fix demos incompatibility with the latest versions of Raysect and Matplotlib

This commit works in progress

- mainly function base modules are modified

this modification is derived from the cython 3.0 compile error.

…`INFINITY` in `libc.math` .

# Conflicts:
#	dev/build_wheels.sh
#	dev/notes/building_bdist_with_manylinux.txt
#	raysect/VERSION

…a longstanding typo.

…tives

Migrate build to meson-python from setuptools

…tives

…g meson.build files. Fixes #448.

# Conflicts:
#	raysect/core/math/sampler/meson.build
#	raysect/optical/observer/imaging/meson.build
#	raysect/optical/observer/nonimaging/meson.build

Add Cython 3.1 support

…3 contributions.

Add new primitive: TORUS 🍩

Small code tidy / copyright update.

Use setuptools-scm for autoversioning

… into the release distribution.

Moved build related scripts (run automatically as part of the build process) out of the root of dev/.

Updated .gitignore (!).

Fix _version.py file not being added to the sdist/wheels.