Move mux functionality into CondSwap chip #238

Job	Run time
Book tests	2m 13s
Build target wasm32-unknown-unknown	2m 37s
Bitrot check	1m 38s
Build target wasm32-wasi	2m 32s
Intra-doc links	2m 23s
Rustfmt	13s
Test on ubuntu-latest	8m 2s
Test on i686-unknown-linux-gnu	14m 22s
Test on windows-latest	10m 24s
Test on i686-unknown-linux-gnu with beta features	14m 29s
Test on macOS-latest	7m 20s
Test on i686-unknown-linux-gnu with nightly features	16m 18s
Test on ubuntu-latest with beta features	7m 59s
Test on windows-latest with beta features	10m 26s
Test on macOS-latest with beta features	10m 34s
Test on ubuntu-latest with nightly features	8m 50s
Test on windows-latest with nightly features	11m 43s
Test on macOS-latest with nightly features	8m 48s
	2h 20m 51s

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