Add better mouse coordinate conversion functions #1363

Job	Run time
sdist	1m 2s
ruff	10s
mypy	27s
parse_sdl (macos-latest, 3.2.16)	29s
parse_sdl (windows-latest, 3.2.16)	41s
pyodide	2m 43s
tox (ubuntu-latest)	2m 8s
test-docs	1m 58s
build-macos (cp310-*_universal2)	1m 52s
build-macos (pp310-*)	3m 47s
linux-wheels (x86_64, pp310-manylinux*)	3m 49s
linux-wheels (aarch64, pp310-manylinux*)	3m 41s
linux-wheels (x86_64, cp310-manylinux*)	3m 51s
linux-wheels (aarch64, cp310-manylinux*)	4m 42s
build (windows-latest, pypy-3.10, x64)	4m 21s
build (ubuntu-latest, pypy-3.10, x64)	3m 15s
build (ubuntu-latest, 3.10, x64)	3m 47s
build (windows-latest, 3.10, x64)	2m 59s
build (windows-latest, 3.10, x86)	4m 57s
publish	-1s
	50m 38s

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