Add TextBuffer and some other things #1507
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This is not ready for prime time yet, but is a starting point.
The TextBuffer can be used to build a rich text string with font/style formatting, that can be appended or inserted into a RichTextArea.
There includes other enhancements to TextArea/RichTextArea such as scrolling to a text range or the beginning/end, getting the text length (without necessarily getting the entire string), adding a BeginEdit/EndEdit for more efficient editing of multiple attributes, etc.
This is missing a WinForms implementation thus far.