EXPERIMENT: try preserving order of indexable set

src/Collections/IndexableSet.cs

@@ -61,6 +61,7 @@ namespace MoonTools.ECS.Collections
 				return false;
 			}
 
+			/*
 			var index = indices[element];
 
 			if (index != Count - 1)
@@ -71,6 +72,18 @@ namespace MoonTools.ECS.Collections
 			}
 			count -= 1;
 			indices.Remove(element);
+			*/
+
+			var index = indices[element];
+
+			for (var i = index; i < Count - 1; i += 1)
+			{
+				array[i] = array[i + 1];
+				indices[array[i]] = i;
+			}
+
+			indices.Remove(element);
+			count -= 1;
 
 			return true;
 		}