feat: upgrade to .NET 6, refactor everything

Myriad/Rest/Exceptions/RatelimitException.cs

@@ -1,29 +1,26 @@
-using System;
-
 using Myriad.Rest.Ratelimit;
 
-namespace Myriad.Rest.Exceptions
+namespace Myriad.Rest.Exceptions;
+
+public class RatelimitException: Exception
 {
-    public class RatelimitException: Exception
+    public RatelimitException(string? message) : base(message) { }
+}
+
+public class RatelimitBucketExhaustedException: RatelimitException
+{
+    public RatelimitBucketExhaustedException(Bucket bucket, TimeSpan retryAfter) : base(
+        "Rate limit bucket exhausted, request blocked")
     {
-        public RatelimitException(string? message) : base(message) { }
+        Bucket = bucket;
+        RetryAfter = retryAfter;
     }
 
-    public class RatelimitBucketExhaustedException: RatelimitException
-    {
-        public RatelimitBucketExhaustedException(Bucket bucket, TimeSpan retryAfter) : base(
-            "Rate limit bucket exhausted, request blocked")
-        {
-            Bucket = bucket;
-            RetryAfter = retryAfter;
-        }
+    public Bucket Bucket { get; }
+    public TimeSpan RetryAfter { get; }
+}
 
-        public Bucket Bucket { get; }
-        public TimeSpan RetryAfter { get; }
-    }
-
-    public class GloballyRatelimitedException: RatelimitException
-    {
-        public GloballyRatelimitedException() : base("Global rate limit hit") { }
-    }
+public class GloballyRatelimitedException: RatelimitException
+{
+    public GloballyRatelimitedException() : base("Global rate limit hit") { }
 }