collect XMR and Aeon characteristics

... into a single place

xmrstak/backend/cryptonight.hpp

+#pragma once
+
+// define aeon settings
+#define AEON_MEMORY 1048576llu
+#define AEON_MASK 0xFFFF0
+#define AEON_ITER 0x40000
+
+// define xmr settings
+#define XMR_MEMORY 2097152llu
+#define XMR_MASK 0x1FFFF0
+#define XMR_ITER 0x80000
+