feat: upgrade to .NET 6, refactor everything

PluralKit.Core/Models/PKShardInfo.cs

@@ -1,19 +1,18 @@
 using NodaTime;
 
-namespace PluralKit.Core
-{
-    public class PKShardInfo
-    {
-        public int Id { get; }
-        public ShardStatus Status { get; }
-        public float? Ping { get; }
-        public Instant? LastHeartbeat { get; }
-        public Instant? LastConnection { get; }
+namespace PluralKit.Core;
 
-        public enum ShardStatus
-        {
-            Down = 0,
-            Up = 1
-        }
+public class PKShardInfo
+{
+    public enum ShardStatus
+    {
+        Down = 0,
+        Up = 1
     }
+
+    public int Id { get; }
+    public ShardStatus Status { get; }
+    public float? Ping { get; }
+    public Instant? LastHeartbeat { get; }
+    public Instant? LastConnection { get; }
 }