Add cmake + native windows support for asymptote, with fully working make support #77

Job	Run time
determine_asy_version	10s
build-gui / build-gui-linux	12s
build-asy-windows / configure-windows-msvc-x64	1m 55s
build-asy-linux / configure-linux-release-x64	39s
build-gui / build-gui-windows	42s
build-asy-linux / build-linux-release-x64	2m 32s
build-asy-windows / build-windows-msvc-x64	5m 45s
build-asy-linux / linux-asy-docgen	4m 1s
build-asy-linux / package-asymptote-artifacts	7s
test-asy-linux / test-x64-asy-tests	30s
test-asy-linux / test-x64-cxxtests	25s
test-asy-windows / test-windows-msvc-x64-asy-tests	53s
test-asy-windows / test-windows-msvc-x64-cxxtests	53s
package-asy-install-file / package-asy-installer	39s
precheck-pass	1s
	19m 24s

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