Split layout into multiple modules #522

Job	Run time
Clippy	1m 29s
Rustfmt	13s
Code Coverage	16s
Build Wasm Examples (callback-example)	49s
semver	52s
Build Wasm Examples (basic)	54s
Tests (windows-latest)	3m 26s
Tests (macos-latest)	3m 16s
Tests (ubuntu-latest)	2m 26s
Build Examples (custom_controls)	28s
Build Examples (kaleido)	1m 16s
Build Examples (basic_charts)	36s
Build Examples (3d_charts)	31s
Build Examples (financial_charts)	34s
Build Examples (subplots)	24s
Build Examples (scientific_charts)	23s
Build Examples (ndarray)	27s
Build Examples (maps)	28s
Build Examples (images)	48s
Build Examples (shapes)	25s
	20m 1s

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