Draw broken objects as fragments, plane tiles for fences and walls, tileset publishing; mod documentation

src/Data/RpgVisualGroup.cs

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+namespace Cthangover.Mods.Rpg
+{
+    using System.Collections.Generic;
+    /// <summary>
+    /// An exact legacy tile pattern describing one whole image. Matching never changes
+    /// collision or event coordinates; partial patterns remain ordinary cells.
+    /// </summary>
+    public class RpgVisualGroup
+    {
+        public string Id { get; set; }
+        public int Width { get; set; }
+        public int Height { get; set; }
+        public int[] Pattern { get; set; }
+        public float AnchorX { get; set; }
+        public float AnchorY { get; set; }
+        /// <summary>Optional same-atlas architectural planes, instead of an upright whole image.</summary>
+        public List<RpgVisualPlane> IsoPlanes { get; set; }
+    }
+}