Preparation for #1.4.0 (#30)

- Fixed CPU affinity on Windows for NUMA and CPUs with lot of cores
- Implemented per thread configurable Multihash mode (double, triple, quadruple, quintuple)
- Rebased from XMRig 2.4.4

src/Cpu_arm.cpp

@@ -27,23 +27,18 @@
 
 #include "Cpu.h"
 
-
-char Cpu::m_brand[64]   = { 0 };
-int Cpu::m_flags        = 0;
-int Cpu::m_l2_cache     = 0;
-int Cpu::m_l3_cache     = 0;
-int Cpu::m_sockets      = 1;
-int Cpu::m_totalCores   = 0;
-int Cpu::m_totalThreads = 0;
-
-
-int Cpu::optimalThreadsCount(int algo, bool doubleHash, int maxCpuUsage)
+void CpuImpl::init()
 {
-    return m_totalThreads;
+    m_brand = {0};
+    m_flags = 0;
+    m_l2_cache = 0;
+    m_l3_cache = 0;
+    m_sockets = 1;
+    m_totalCores = 0;
+    m_totalThreads = 0;
 }
 
-
-void Cpu::initCommon()
+void CpuImpl::initCommon()
 {
     memcpy(m_brand, "Unknown", 7);