Split layout into multiple modules #513

Job	Run time
Tests (ubuntu-latest)	2m 37s
Tests (windows-latest)	3m 31s
Clippy	3m 24s
Build Wasm Examples (wasm-yew-minimal)	53s
Build Examples (3d_charts)	23s
Build Wasm Examples (wasm-yew-callback-minimal)	55s
Build Examples (basic_charts)	25s
Tests (macos-latest)	2m 36s
Rustfmt	13s
Build Examples (custom_controls)	38s
semver	1m 6s
Build Examples (financial_charts)	23s
Code Coverage	8s
Build Examples (images)	46s
Build Examples (kaleido)	1m 11s
Build Examples (maps)	46s
Build Examples (ndarray)	30s
Build Examples (scientific_charts)	21s
Build Examples (shapes)	24s
Build Examples (subplots)	24s
	21m 34s

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