Introduce vector_ref::cleanse, code adapted from openSSL. Introduce secure_vector and bytesSec, make Secret auto-cleansing.
Introduce vector_ref::cleanse, code adapted from openSSL.
Introduce secure_vector and bytesSec, make Secret auto-cleansing.

ethereum/mix,chriseth/mix,vaporry/mix,LianaHus/mix,LefterisJP/mix,LefterisJP/mix,ethereum/mix,LianaHus/mix,tomthebuzz/mix,vaporry/mix,yann300/mix,LefterisJP/mix,yann300/mix,chriseth/mix,vaporry/mix,tomthebuzz/mix,yann300/mix,chriseth/mix,LianaHus/mix,ethereum/mix,tomthebuzz/mix