Function IsUtf16LowSurrogate

src/String.cpp:91–94

   return ch>=0xd800 && ch<0xe000;
}
inline static bool IsUtf16LowSurrogate(int ch)
{
   return ch>=0xdc00 && ch<0xe000;
}
inline static bool IsUtf16HighSurrogate(int ch)
{
   return ch>=0xd800 && ch<0xdc00;