xilem: Button with customisable label(text) #2455

Job	Run time
cargo check (msrv) (wasm32)	25s
cargo check (aarch64-android)	22s
cargo clippy (windows-latest)	27s
cargo check (msrv) (windows-latest)	1m 59s
cargo clippy (macos-latest)	28s
cargo check (msrv) (macos-latest)	43s
cargo clippy (ubuntu-latest)	30s
cargo check (msrv) (ubuntu-latest)	46s
cargo clippy (wasm32)	1m 58s
cargo doc	41s
formatting	34s
Prime LFS Cache	4s
cargo test (wasm32)	23s
typos	4s
cargo test (windows-latest)	3m 14s
cargo test (macos-latest)	1m 46s
cargo test (ubuntu-latest)	3m 48s
	18m 12s

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