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feature: added xtask, don't track wgsl as text, remove wgsl files #515

Job	Run time
renderling-test-linux	7m 21s
install-cargo-gpu (ubuntu-latest)	53s
renderling-build-example	3m 43s
renderling-clippy	43s
install-cargo-gpu (macos-latest)	57s
renderling-test-macos	1m 56s
install-cargo-gpu (windows-latest)	3m 23s
renderling-test-windows	1m 33s
renderling-build-shaders (ubuntu-latest)	48s
renderling-build-shaders (macos-latest)	54s
renderling-build-shaders (windows-latest)	28s
	22m 39s

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