Added a function to check for the existence of a region.

RecrownedAthenaeum/SpecialTypes/TextureAtlas.cs

@@ -73,6 +73,16 @@ namespace RecrownedAthenaeum.SpecialTypes
             return dictionaryOfRegions[name].AsTexture2D(graphicsDevice);
         }
 
+        /// <summary>
+        /// Whether or not this atlas contains the given region name.
+        /// </summary>
+        /// <param name="regionName">The name of the region to check for.</param>
+        /// <returns>True if this atlas does contain the region given by name.</returns>
+        public bool ContainsRegion(string regionName)
+        {
+            return dictionaryOfRegions.ContainsKey(regionName);
+        }
+
         /// <summary>
         /// Disposes unmanaged resources for the texture atlas.
         /// </summary>