added rx/0 monero algorithm
added rx/64 c64 algorithm variant for c64chain (https://c64.suprnova.cc)
some compiler optimizations, finally made the switch to clang. up to 20% gain for xel on non-avx512 systems.
added ric (Riecoin) algo for pool ric.suprnova.cc . stelo needs --no-extranonce and works as well. (not for arm yet)
added Gap algo for Gapcoin (gap.suprnova.cc)
Bugfix release for duplicate shares on rx/juno