WIP: Vulkan sampling support #127

Job	Run time
build-macos (linux, x64, release)	29s
build-linux (linux, x86)	38s
build-android (android, armv7, release, 21)	1m 8s
build-windows (windows, x86, debug, 14.3)	1m 24s
build-linux (linux, x64)	27s
build-android (android, arm64, release, 21)	44s
build-windows (windows, x86, debug, 14.2)	1m 8s
build-windows (windows, x86, debug, 14.1)	1m 3s
build-windows (windows, x86, release, 14.3)	39s
build-windows (windows, x86, release, 14.2)	1m 24s
build-windows (windows, x86, release, 14.1)	59s
build-windows (windows, x64, debug, 14.3)	1m 5s
build-windows (windows, x64, debug, 14.2)	1m 10s
build-windows (windows, x64, debug, 14.1)	1m 6s
build-windows (windows, x64, release, 14.3)	1m 27s
build-windows (windows, x64, release, 14.2)	1m 14s
build-windows (windows, x64, release, 14.1)	1m 7s
	17m 12s

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