moving IVidgetBackend.PointToClient to IDragDopControl
moving IVidgetBackend.PointToClient II
IDragDOPControl => IDragDROPControl
use changed DragDropConverter params
remove Playground/Rectangle
GdiConverter: moved Matirx-Operations to Xwt.Gdi.Backend
Limaki.WPF removed
Viewport: rename _scrollMinSize => _dataSize
IVidgetBackend.ClientRectangle moved to IDragDropControl
rename ImageDisplayBackend => SdImageDisplayBackend (System.Drawing)