Add cmake + native windows support for asymptote, with fully working make support #62

Job	Run time
determine_asy_version	8s
build-asy-windows / configure-windows-msvc-x64	7m 15s
build-asy-linux / configure-linux-release-x64	42s
build-gui / build-gui-linux	11s
build-gui / build-gui-windows	50s
build-asy-linux / build-linux-release-x64	1m 24s
build-asy-linux / linux-asy-docgen	2m 22s
build-asy-linux / package-asymptote-artifacts	6s
test-asy-linux / test-x64-cxxtests	28s
test-asy-linux / test-x64-asy-tests	32s
build-asy-windows / build-windows-msvc-x64	10m 43s
test-asy-windows / test-windows-msvc-x64-cxxtests	28s
test-asy-windows / test-windows-msvc-x64-asy-tests	17s
package-asy-install-file / package-asy-installer	1m 1s
precheck-pass	0s
	26m 27s

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