xilem: Button with customisable label(text) #2465

Job	Run time
cargo check (msrv) (wasm32)	16s
cargo clippy (windows-latest)	31s
cargo check (aarch64-android)	21s
cargo clippy (macos-latest)	27s
cargo check (msrv) (windows-latest)	23s
cargo clippy (ubuntu-latest)	31s
cargo check (msrv) (macos-latest)	23s
cargo clippy (wasm32)	1m 54s
cargo doc	19s
cargo check (msrv) (ubuntu-latest)	24s
formatting	30s
Prime LFS Cache	9s
cargo test (wasm32)	21s
typos	3s
cargo test (windows-latest)	1m 15s
cargo test (macos-latest)	35s
cargo test (ubuntu-latest)	1m 2s
	9m 24s

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