Implemented CN-Heavy algo, Algo tests and fixed n-loop variants (#86)

* Debouncing of connection retry when connecting donation server fails
* When PoW variant is set on proxy, it will overrule local set PoW
* Implementation of cn_heavy algo
* Added self test for cn-heavy
* Fixed n-loop variant of powV2 and cn-heavy
* Fixed n-loop variant of powV2 and added cn-heavy for ARM
* Fixing n-loop for arm
* Limited cn-heavy to max hashfactor 3 on higher seltest fails.
* Removed a lot of casts
* Fixed algo selftest

src/Options.h

@@ -44,6 +44,7 @@ public:
     enum Algo {
         ALGO_CRYPTONIGHT,      /* CryptoNight (Monero) */
         ALGO_CRYPTONIGHT_LITE, /* CryptoNight-Lite (AEON) */
+        ALGO_CRYPTONIGHT_HEAVY /* CryptoNight-Heavy (SUMO) */
     };
 
     enum AlgoVariant {