feat: upgrade to .NET 6, refactor everything

PluralKit.API/Authorization/PrivacyRequirement.cs

@@ -1,18 +1,15 @@
-using System;
-
 using Microsoft.AspNetCore.Authorization;
 
 using PluralKit.Core;
 
-namespace PluralKit.API
-{
-    public class PrivacyRequirement<T>: IAuthorizationRequirement
-    {
-        public readonly Func<T, PrivacyLevel> Mapper;
+namespace PluralKit.API;
 
-        public PrivacyRequirement(Func<T, PrivacyLevel> mapper)
-        {
-            Mapper = mapper;
-        }
+public class PrivacyRequirement<T>: IAuthorizationRequirement
+{
+    public readonly Func<T, PrivacyLevel> Mapper;
+
+    public PrivacyRequirement(Func<T, PrivacyLevel> mapper)
+    {
+        Mapper = mapper;
     }
 }