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feature: added xtask, don't track wgsl as text, remove wgsl files #540

Job	Run time
renderling-test-linux	4m 37s
renderling-build-example	1m 2s
renderling-clippy	49s
install-cargo-gpu (ubuntu-latest)	49s
install-cargo-gpu (macos-latest)	56s
renderling-test-macos	1m 46s
install-cargo-gpu (windows-latest)	2m 49s
renderling-test-windows	2m 14s
renderling-build-shaders (ubuntu-latest)	22s
renderling-build-shaders (macos-latest)	26s
renderling-build-shaders (windows-latest)	27s
	16m 17s

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