Split layout into multiple modules #509

Job	Run time
Rustfmt	14s
Tests (ubuntu-latest)	2m 29s
Tests (windows-latest)	4m 46s
Tests (macos-latest)	2m 37s
Clippy	3m 2s
Build Wasm Examples (wasm-yew-minimal)	56s
Build Examples (3d_charts)	27s
Build Wasm Examples (wasm-yew-callback-minimal)	53s
Code Coverage	12s
Build Examples (basic_charts)	29s
semver	45s
Build Examples (custom_controls)	22s
Build Examples (financial_charts)	27s
Build Examples (images)	39s
Build Examples (kaleido)	1m 50s
Build Examples (maps)	23s
Build Examples (ndarray)	23s
Build Examples (scientific_charts)	22s
Build Examples (shapes)	23s
Build Examples (subplots)	28s
	22m 7s

Provide feedback