Migrate to more privacy helper extensions

PluralKit.Core/Models/Privacy.cs

@@ -11,8 +11,23 @@
         public static bool CanAccess(this PrivacyLevel level, LookupContext ctx) =>
             level == PrivacyLevel.Public || ctx == LookupContext.ByOwner;
 
-        public static string Name(this PrivacyLevel level) => 
+        public static string LevelName(this PrivacyLevel level) => 
             level == PrivacyLevel.Public ? "public" : "private";
+
+        public static T Get<T>(this PrivacyLevel level, LookupContext ctx, T input, T fallback = default) =>
+            level.CanAccess(ctx) ? input : fallback;
+
+        public static bool TryGet<T>(this PrivacyLevel level, LookupContext ctx, T input, out T output, T absentValue = default)
+        {
+            output = default;
+            if (!level.CanAccess(ctx))
+                return false;
+            if (Equals(input, absentValue))
+                return false;
+
+            output = input;
+            return true;
+        }
     }
 
     public enum LookupContext