Split layout into multiple modules #511

Job	Run time
semver	45s
Clippy	2m 19s
Build Wasm Examples (wasm-yew-minimal)	50s
Build Examples (3d_charts)	30s
Code Coverage	12s
Build Wasm Examples (wasm-yew-callback-minimal)	57s
Rustfmt	12s
Tests (ubuntu-latest)	2m 11s
Build Examples (basic_charts)	36s
Tests (windows-latest)	3m 57s
Build Examples (custom_controls)	22s
Tests (macos-latest)	3m 56s
Build Examples (financial_charts)	32s
Build Examples (images)	44s
Build Examples (kaleido)	1m 17s
Build Examples (maps)	23s
Build Examples (ndarray)	26s
Build Examples (scientific_charts)	39s
Build Examples (shapes)	23s
Build Examples (subplots)	21s
	21m 32s

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