838: remove MyGLControl from OpenTK

MyGLControl is specific with each app
842: MyCanvasGLBase,

replace old base class
845: class  MyCanvasGL : Canvas, IFonts
845.1
847: DrawText
850: CanvasOrientation, LeftBottom or LeftTop
851: fixed SetCanvasOrigin
Merge branch 'deps_analysis' into v_mini01
852: fixed update canvas area, rename files
853: add default currentClipRect
854: arrange code in MyCanvasGL