remove ui namespace which is not really used, move CameraData in camera_modes.h to avoid the inclusion of canva.h

src/shape.h

@@ -9,8 +9,6 @@ enum class kShapeType : uint16_t
     Slice9 = const_hash("slice9"),
 };
 
-namespace ui {
-
 class Shape
 {
 protected:
@@ -221,5 +219,3 @@ public:
         return create_buffers(idx.get(), vertices.get(), rings * sectors * 6 * sizeof(GLushort), rings * sectors * sizeof(vertex_t));
     }
 };
-
-}