Initial JSON API implementation

Compile cleanup

This is to avoid getting stuck on the same IP which doesn't work for whatever reason.

pool.supportxmr.com uses DNS for load balancing, and it had issues with xmr-stak miners when one of the servers went down and all xmr-stak miners that were on that server didn't switch to the other working server. This change fixes the bug.

Slight keccak optimization

AES override feature

CMake: change GCC to g++ warning

HWLOC allocation algorithm cleanup

fix wrong cache method

- fix wrong implemented method `isCacheExclusive()`
- round up number of hashes if >= 1 MiB cache is available

fix rewrite of the hwloc autosuggestion

- fix exclusive cache detection
- fix usage of wrong cache size

Fix handling of stratum+tcp:// format

Added instructions for building on FreeBSD

Appveyor fix