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feature: added xtask, don't track wgsl as text, remove wgsl files #536

Job	Run time
renderling-test-linux	4m 36s
install-cargo-gpu (ubuntu-latest)	58s
renderling-build-example	1m 5s
install-cargo-gpu (macos-latest)	49s
renderling-clippy	36s
install-cargo-gpu (windows-latest)	2m 32s
renderling-test-macos	3m 25s
renderling-test-windows	1m 39s
renderling-build-shaders (ubuntu-latest)	2m 47s
renderling-build-shaders (macos-latest)	2m 31s
renderling-build-shaders (windows-latest)	2m 40s
	23m 38s

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