StringBuffer.GetSize is the byte count, not length

[heaths]

While the name GetSize I arguably obvious that its a byte count, the fact it's on a StringBuffer can make it's use questionable. For example, all examples of serializing a JSON graph to a string do something like so:

string content(buffer.GetString(), buffer.GetSize());

But when typedef'ing a StringBuffer with UTF16<>, the following code can cause access violations.

wstring content(buffer.Getstring(), buffer.GetSize());

Instead, we need to divide the character byte length:

wstring content(buffer.Getstring(), buffer.GetSize() / sizeof(WStringBuffer::Ch));

Since the Ch typedef is known, and thus the byte size, adding a GetLength() and using that in examples to avoid confusion would be advisable.

[heaths]

That works too. I had a change I was about to send a PR for, but thanks!