add restore_mnemonic #216

Job	Run time
lib_android (monero)	25m 22s
lib_android (wownero)	25m 9s
lib_darwin (monero)	13m 22s
lib_darwin (wownero)	13m 39s
ios build (monero)	13m 8s
lib_linux (monero)	30m 30s
ios build (wownero)	11m 49s
macos build (monero)	3m 59s
lib_linux (wownero)	30m 25s
macos build (wownero)	3m 6s
lib_mingw (monero)	3m 13s
lib_mingw (wownero)	3m 19s
lib_sailfishos_aarch64 (monero)	3m 7s
lib_sailfishos_aarch64 (wownero)	3m 16s
lib_sailfishos_i486 (monero)	2m 4s
lib_sailfishos_i486 (wownero)	2m 1s
test ts library	48s
comment on pr	6s
regression_check (monero)	3m 36s
create single release file	41s
regression_check (wownero)	12m 5s
	3h 24m 45s

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