785: clean up before gl1.1
803: limit to OpenGL1.2 API

use gl1_3, gl2_0 directive to limit the API
809: move code , debug err
811: UnsafeDrawV2fList, UnsafeDrawV2fList
812: Canvas2d DrawRect(), FillRect()
Merge branch 'gl1.1_dev' into opengl-1.1
813: DrawSample02.cs
814: GLBlendHLine
815: fixed CanvasGL2d.FillRect

send color to UnsafeDrawV2fList()
816: temp fix scan line split in some screen

see GL.Viewport(0, 0, max, max - 1);
817: SetupDefaultFonts(),
Merge branch 'opengl-1.1' into v_canvas