Move mux functionality into CondSwap chip #233

Job	Run time
Bitrot check	1m 34s
Book tests	2m 5s
Build target wasm32-unknown-unknown	2m 32s
Build target wasm32-wasi	2m 27s
Intra-doc links	2m 20s
Rustfmt	14s
Test on ubuntu-latest	8m 3s
Test on windows-latest	10m 21s
Test on i686-unknown-linux-gnu	14m 12s
Test on macOS-latest	9m 0s
Test on i686-unknown-linux-gnu with beta features	13m 49s
Test on ubuntu-latest with beta features	8m 0s
Test on i686-unknown-linux-gnu with nightly features	16m 13s
Test on windows-latest with beta features	10m 10s
Test on macOS-latest with beta features	11m 18s
Test on ubuntu-latest with nightly features	9m 6s
Test on windows-latest with nightly features	11m 33s
Test on macOS-latest with nightly features	9m 36s
	2h 22m 33s

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