Merge windows changes back into Vulkan branch #153

Job	Run time
determine_asy_version	6s
lint-non-gui-files / check-if-non-gui-py-files-changed	5s
lint-non-gui-files / lint-python-files	8s
build-asy-windows / configure-windows-msvc-x64	4m 48s
build-asy-linux / configure-linux-release-x64	1m 24s
build-gui / build-gui-linux	13s
build-gui / build-gui-windows	58s
build-asy-linux / build-linux-release-x64	3m 48s
build-asy-windows / build-windows-msvc-x64	7m 55s
build-asy-linux / linux-asy-docgen	5m 2s
build-asy-linux / package-asymptote-artifacts	14s
test-asy-linux / test-x64-cxxtests	45s
test-asy-linux / test-x64-asy-tests	57s
test-asy-windows / test-windows-msvc-x64-asy-tests	1m 27s
test-asy-windows / test-windows-msvc-x64-cxxtests	1m 4s
package-asy-install-file / package-asy-installer	1m 10s
precheck-pass	1s
	30m 5s

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