Exclude Settings class from renaming

Fix #178

Confuser.Core/DnlibUtils.cs

@@ -133,6 +133,25 @@ namespace Confuser.Core {
 			return false;
 		}
 
+		/// <summary>
+		///     Determines whether the specified type is inherited from a base type.
+		/// </summary>
+		/// <param name="type">The type.</param>
+		/// <param name="baseType">The full name of base type.</param>
+		/// <returns><c>true</c> if the specified type is inherited from a base type; otherwise, <c>false</c>.</returns>
+		public static bool InheritsFrom(this TypeDef type, string baseType) {
+			if (type.BaseType == null)
+				return false;
+
+			TypeDef bas = type;
+			do {
+				bas = bas.BaseType.ResolveTypeDefThrow();
+				if (bas.ReflectionFullName == baseType)
+					return true;
+			} while (bas.BaseType != null);
+			return false;
+		}
+
 		/// <summary>
 		///     Determines whether the specified type implements the specified interface.
 		/// </summary>

Confuser.Renamer/AnalyzePhase.cs

@@ -122,6 +122,10 @@ namespace Confuser.Renamer {
 			if (type.InheritsFromCorlib("System.Attribute")) {
 				service.ReduceRenameMode(type, RenameMode.ASCII);
 			}
+
+			if (type.InheritsFrom("System.Configuration.SettingsBase")) {
+				service.SetCanRename(type, false);
+			}
 		}
 
 		void Analyze(NameService service, ConfuserContext context, ProtectionParameters parameters, MethodDef method) {