Added round rectangle, cicle and triangle.

Applied Antialias on most of elements.

Progrart.Core/Graphics/Rectangle.cs

@@ -74,7 +74,6 @@ namespace Progrart.Core.Graphics
 			LoadProperties();
 			SKPoint FinalStartPos = context.TranslatePoint(Start);
 			SKPoint FinalEndPos = context.TranslatePoint(Size);
-			Trace.WriteLine($"Draw Rectangle from {FinalStartPos} to {FinalEndPos} using {Color} with size of {StrokeWidth}.");
 			context.DrawingCore.canvas.DrawRect(
 				FinalStartPos.X, FinalStartPos.Y,
 				FinalEndPos.X, FinalEndPos.Y,
@@ -83,7 +82,8 @@ namespace Progrart.Core.Graphics
 					ColorF = Color,
 					StrokeWidth = context.TranslateSize(StrokeWidth),
 					Shader = shader,
-					IsStroke = true
+					IsStroke = IsStroke,
+					IsAntialias = true
 				}
 			);
 		}