Initial work for new text gradients
Support for closest-corner, farthest-corner, .., and radial offset
Small cleanup
Update Topten.RichTextKit.dll
Cleanup & some parser error awareness
Remove D_TEXT_BACKGROUND_IMAGE
Mark GradientInfo internal, text gradients set explicitly by style
Update Topten.RichTextKit.dll
Tuck gradient type away into GradientInfo
