Split layout into multiple modules #510

Job	Run time
Rustfmt	15s
Tests (ubuntu-latest)	2m 25s
Build Wasm Examples (wasm-yew-minimal)	47s
Build Examples (3d_charts)	23s
Tests (windows-latest)	3m 1s
Build Wasm Examples (wasm-yew-callback-minimal)	49s
Clippy	2m 2s
Build Examples (basic_charts)	22s
Tests (macos-latest)	2m 22s
Build Examples (custom_controls)	24s
Code Coverage	7s
Build Examples (financial_charts)	22s
semver	42s
Build Examples (images)	39s
Build Examples (kaleido)	1m 34s
Build Examples (maps)	21s
Build Examples (ndarray)	23s
Build Examples (scientific_charts)	22s
Build Examples (shapes)	44s
Build Examples (subplots)	21s
	18m 25s

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