Refactor logging to use util::logf and add log utility header

src/util/hex.h

@@ -2,6 +2,7 @@
 #define YAZE_UTIL_HEX_H
 
 #include <cstdint>
+#include <string>
 
 namespace yaze {
 namespace util {
@@ -17,4 +18,6 @@ std::string HexLong(uint32_t dword, HexStringParams params = {});
 std::string HexLongLong(uint64_t qword, HexStringParams params = {});
 
 }  // namespace util
-}  // namespace yaze
+}  // namespace yaze
+
+#endif