WIP: Vulkan sampling support #131

Job	Run time
build-macos (linux, x64, release)	24s
build-linux (linux, x86)	25s
build-android (android, armv7, release, 21)	20s
build-linux (linux, x64)	23s
build-windows (windows, x86, debug, 14.3)	1m 35s
build-android (android, arm64, release, 21)	29s
build-windows (windows, x86, debug, 14.2)	1m 32s
build-windows (windows, x86, debug, 14.1)	1m 11s
build-windows (windows, x86, release, 14.3)	1m 22s
build-windows (windows, x86, release, 14.2)	1m 18s
build-windows (windows, x86, release, 14.1)	1m 10s
build-windows (windows, x64, debug, 14.3)	1m 9s
build-windows (windows, x64, debug, 14.2)	1m 8s
build-windows (windows, x64, debug, 14.1)	1m 6s
build-windows (windows, x64, release, 14.3)	1m 20s
build-windows (windows, x64, release, 14.2)	1m 18s
build-windows (windows, x64, release, 14.1)	1m 6s
	17m 16s

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