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Implement cross-platform self-contained binaries #192

Job	Run time
Set up	7s
Stable / Build source zip	1m 46s
Git / Build source zip	3m 22s
Stable / Build (i686, win, ubuntu-latest, ghcr.io/openslide/winbuild-builder:latest)	1m 54s
Stable / Build (x86_64, win, ubuntu-latest, ghcr.io/openslide/winbuild-builder:latest)	1m 55s
Stable / Build (x86_64, linux, ubuntu-latest, ghcr.io/openslide/winbuild-builder:latest)	1m 56s
Stable / Build (x86_64, mac, macos-latest)	1m 51s
Git / Build (i686, win, ubuntu-latest, ghcr.io/openslide/winbuild-builder:latest)	1m 56s
Git / Build (x86_64, win, ubuntu-latest, ghcr.io/openslide/winbuild-builder:latest)	1m 55s
Git / Build (x86_64, linux, ubuntu-latest, ghcr.io/openslide/winbuild-builder:latest)	1m 40s
Git / Build (x86_64, mac, macos-latest)	2m 5s
Stable / Smoke test	0s
Git / Smoke test	0s
	20m 27s

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