Implementation of Overwinter transaction format ZIP 202.

src/utilstrencodings.h

@@ -25,6 +25,7 @@
 std::string SanitizeFilename(const std::string& str);
 std::string SanitizeString(const std::string& str);
 std::string HexInt(uint32_t val);
+uint32_t ParseHexToUInt32(const std::string& str);
 std::vector<unsigned char> ParseHex(const char* psz);
 std::vector<unsigned char> ParseHex(const std::string& str);
 signed char HexDigit(char c);