Function PercentEncode_Add

Source/MediaInfo/Reader/Reader_libcurl.cpp:213–221

---------------------------------------------------------------------------

//---------------------------------------------------------------------------
inline void PercentEncode_Add(string& In, char Char)
{
    unsigned char v=(unsigned char)Char;
    unsigned char h=v>>4;
    unsigned char l=v&0xF;
    In+='%';
    In+=(char)((h>=10?'A'-10:'0')+h);
    In+=(char)((l>=10?'A'-10:'0')+l);
}
string PercentEncode(const string& In)
{
    string Result;