Revert "add center property to rectangle"

This reverts commit bdd54d3.

Author: tocsoft

src/SixLabors.Core/Primitives/Rectangle.cs

@@ -110,16 +110,6 @@ public Size Size
             }
         }
 
-        /// <summary>
-        /// Gets the coordinates of the center of the rectangular region represented by this <see cref="RectangleF"/>.
-        /// </summary>
-        [EditorBrowsable(EditorBrowsableState.Never)]
-        public Point Center
-        {
-            [MethodImpl(MethodImplOptions.AggressiveInlining)]
-            get => new Point(this.X + (this.Width / 2), this.Y + (this.Height / 2));
-        }
-
         /// <summary>
         /// Gets a value indicating whether this <see cref="Rectangle"/> is empty.
         /// </summary>

src/SixLabors.Core/Primitives/RectangleF.cs

@@ -110,16 +110,6 @@ public SizeF Size
             }
         }
 
-        /// <summary>
-        /// Gets the coordinates of the center of the rectangular region represented by this <see cref="RectangleF"/>.
-        /// </summary>
-        [EditorBrowsable(EditorBrowsableState.Never)]
-        public PointF Center
-        {
-            [MethodImpl(MethodImplOptions.AggressiveInlining)]
-            get => new PointF(this.X + (this.Width / 2), this.Y + (this.Height / 2));
-        }
-
         /// <summary>
         /// Gets a value indicating whether this <see cref="RectangleF"/> is empty.
         /// </summary>