xilem: Button with customisable label(text) #2466

Job	Run time
cargo check (aarch64-android)	21s
cargo check (msrv) (windows-latest)	1m 29s
cargo check (msrv) (wasm32)	20s
cargo clippy (windows-latest)	4m 26s
cargo check (msrv) (macos-latest)	33s
cargo clippy (wasm32)	2m 3s
cargo clippy (macos-latest)	2m 7s
cargo check (msrv) (ubuntu-latest)	40s
cargo clippy (ubuntu-latest)	3m 13s
cargo doc	41s
formatting	33s
Prime LFS Cache	3s
cargo test (wasm32)	23s
typos	5s
cargo test (windows-latest)	3m 35s
cargo test (macos-latest)	1m 28s
cargo test (ubuntu-latest)	3m 14s
	25m 14s

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