7815: plan add MiniAgg Platform support

see .. another repo at prepare/agg-sharp
7816: LayoutFarm.Platforms.Drawing

move drawing module from Layoutfarm.Platform.WinForms to
LayoutFarm.Platforms.Drawing
7817: Layoutfarm.ClientPlatforms

rename project ,
dependency analysis
7818: move Svg projects to related_projects folder

and remove OpenTK folder,
We will Add MiniAgg Instead
Merge branch 'v_miniAgg' into v_dev
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
7836: remove IGraphics
7837: fix canvas stroke width
7839: pass only Painter to CssBox.Paint()
7845: Canvas Interface
7848: Canvas ...