7821: modify dependency on BaseRenderer

remove BaseRenderer pro reference from LayoutFarm.Platforms.Drawing

add  IVisualDrawingChain and ITopWindowRenderBox
7822: remove _useGdiPlusTextRendering option
7824: clean up Canvas
7825: clean up Canvas cont...
7827: Canvas interfaces...
7828: HtmlIsland.ctor
7829: remove IGraphics SampleIGraphics
7832: Canvas
7833: remove Canvas's  Font stack
Merge branch 'v_miniAgg' into v_dev