Generalize settings annotations

ALttPRandomizer/Settings/Attributes.cs

@@ -0,0 +1,21 @@
+namespace ALttPRandomizer.Settings {
+    using System;
+
+    internal class SettingNameAttribute : Attribute {
+        public SettingNameAttribute(string name) {
+            this.Name = name;
+        }
+
+        public string Name { get; }
+    }
+
+    internal class NoSettingNameAttribute : Attribute { }
+
+    internal class AdditionalSettingAttribute : Attribute {
+        public AdditionalSettingAttribute(string setting) {
+            this.Setting = setting;
+        }
+
+        public string Setting { get; }
+    }
+}