Debugger: Merge qtcreatorcdbext/base64.{h,cpp} into stringutils

There was only one function left and this wasn't related to
base64 anymore.

Change-Id: I071fb383bc3d79b606859cbfc79995dd7345a0a5
Reviewed-by: David Schulz <david.schulz@theqtcompany.com>

src/libs/qtcreatorcdbext/stringutils.h

@@ -228,4 +228,7 @@ private:
 // Format a map as a GDBMI hash {key="value",..}
 void formatGdbmiHash(std::ostream &os, const std::map<std::string, std::string> &, bool closeHash = true);
 
+// Hex encoding helpers
+void hexEncode(std::ostream &str, const unsigned char *source, size_t sourcelen);
+
 #endif // STRINGUTILS_H