Merge windows changes back into Vulkan branch #149

Job	Run time
determine_asy_version	8s
lint-non-gui-files / check-if-non-gui-py-files-changed	5s
lint-non-gui-files / lint-python-files	9s
build-gui / build-gui-windows	50s
build-gui / build-gui-linux	11s
build-asy-linux / configure-linux-release-x64	34m 59s
build-asy-windows / configure-windows-msvc-x64	40m 22s
build-asy-linux / build-linux-release-x64	42s
build-asy-linux / linux-asy-docgen	0s
build-asy-linux / package-asymptote-artifacts	0s
test-asy-linux	0s
build-asy-windows / build-windows-msvc-x64	6m 12s
test-asy-windows	0s
package-asy-install-file	0s
precheck-pass	0s
	1h 23m 38s

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