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Add a `widgets` module and a default theme #252

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Run time

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Job	Run time
Rustfmt	5s
Clippy on macos-latest	2m 24s
Clippy on ubuntu-latest	1m 45s
Clippy on windows-latest	3m 42s
Rust on macos-latest	4m 21s
Rust on ubuntu-latest	4m 51s
Rust on windows-latest	5m 24s
	22m 32s