Rename Context2d to CanvasRenderingContext2D

Ooui/Canvas.cs

@@ -4,7 +4,7 @@ namespace Ooui
 {
     public class Canvas : Element
     {
-        Context2d context2d = new Context2d ();
+        CanvasRenderingContext2D context2d = new CanvasRenderingContext2D ();
         int gotContext2d = 0;
 
         int width = 150;

Ooui/CanvasRenderingContext2D.cs

@@ -0,0 +1,10 @@
+namespace Ooui
+{
+    public class CanvasRenderingContext2D : EventTarget
+    {
+        public CanvasRenderingContext2D ()
+            : base ("#canvasRenderingContext2D")
+        {
+        }
+    }
+}

Ooui/Context2d.cs

@@ -1,10 +0,0 @@
-namespace Ooui
-{
-    public class Context2d : EventTarget
-    {
-        public Context2d()
-            : base ("context2d")
-        {
-        }
-    }
-}