Add RGBW and generic led strip size support #260

Job	Run time
quick-tests	1m 38s
version-manager	26s
deploy-doc	2m 8s
build-python (aarch64, auto)	4m 25s
build-cpp (armv7-unknown-linux-gnueabihf)	52s
build-python (aarch64, musllinux_1_1)	2m 35s
build-python (armv7, auto)	3m 58s
build-cpp (aarch64-unknown-linux-gnu)	51s
build-python (armv7, musllinux_1_1)	2m 53s
build-cpp (armv7-unknown-linux-musleabihf)	1m 0s
build-cpp (aarch64-unknown-linux-musl)	52s
raspberry-test-python	38s
release-assets	0s
python-release-pypi	0s
	22m 16s

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