WIP: Vulkan sampling support #128

Job	Run time
build-android (android, armv7, release, 21)	52s
build-android (android, arm64, release, 21)	1m 22s
build-macos (linux, x64, release)	26s
build-windows (windows, x86, debug, 14.3)	1m 5s
build-linux (linux, x86)	36s
build-windows (windows, x86, debug, 14.2)	1m 8s
build-linux (linux, x64)	35s
build-windows (windows, x86, debug, 14.1)	52s
build-windows (windows, x86, release, 14.3)	1m 2s
build-windows (windows, x86, release, 14.2)	1m 4s
build-windows (windows, x86, release, 14.1)	59s
build-windows (windows, x64, debug, 14.3)	1m 15s
build-windows (windows, x64, debug, 14.2)	1m 13s
build-windows (windows, x64, debug, 14.1)	1m 18s
build-windows (windows, x64, release, 14.3)	59s
build-windows (windows, x64, release, 14.2)	1m 4s
build-windows (windows, x64, release, 14.1)	1m 14s
	17m 4s

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