Split layout into multiple modules #514

Job	Run time
Clippy	3m 4s
Rustfmt	15s
Build Wasm Examples (wasm-yew-minimal)	56s
Build Examples (3d_charts)	27s
Build Wasm Examples (wasm-yew-callback-minimal)	57s
Code Coverage	12s
semver	52s
Tests (ubuntu-latest)	2m 20s
Build Examples (basic_charts)	30s
Build Examples (custom_controls)	25s
Tests (windows-latest)	3m 39s
Build Examples (financial_charts)	30s
Tests (macos-latest)	2m 43s
Build Examples (images)	42s
Build Examples (kaleido)	1m 26s
Build Examples (maps)	31s
Build Examples (ndarray)	23s
Build Examples (scientific_charts)	29s
Build Examples (shapes)	28s
Build Examples (subplots)	35s
	21m 24s

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