718: DrawSample08_DrawText2

test render gdi font on bmp and then copy to GL texture
plan: implement texture atlas
719: LazyBitmapBufferProvider and TextureAtlas

not complete Texture Atlas
725: Canvas.DrawImage , GLBitmapReference
726: 03_SimpleDraw3
727: GdiTextBoard

basic , simple bitmap glyph, no kerning support.
728: GdiTextBoard with transparent bg
729: polygon fill
731: GdiTextBoard, Clear with White Bg first

Windows Font sub pixel rendering will take effect
734: FontABC
Merge branch 'v_text' into v_layoutfarm.drawing