Updated some namespaces, finished some todos. v5 should be cancelled probably as the code is too intertwined to make it modular

src/Nadeko.Common/NadekoRandom.cs

@@ -3,7 +3,7 @@ using System.Security.Cryptography;
 
 namespace Nadeko.Common;
 
-public class NadekoRandom : Random
+public sealed class NadekoRandom : Random
 {
     private readonly RandomNumberGenerator _rng;
 
@@ -16,27 +16,25 @@ public class NadekoRandom : Random
         _rng.GetBytes(bytes);
         return Math.Abs(BitConverter.ToInt32(bytes, 0));
     }
-
+    
+    /// <summary>
+    /// Generates a random integer between 0 (inclusive) and
+    /// a specified exclusive upper bound using a cryptographically strong random number generator.
+    /// </summary>
+    /// <param name="maxValue">Exclusive max value</param>
+    /// <returns>A random number</returns>
     public override int Next(int maxValue)
-    {
-        if (maxValue <= 0)
-            throw new ArgumentOutOfRangeException(nameof(maxValue));
-        var bytes = new byte[sizeof(int)];
-        _rng.GetBytes(bytes);
-        return Math.Abs(BitConverter.ToInt32(bytes, 0)) % maxValue;
-    }
+        => RandomNumberGenerator.GetInt32(maxValue);
 
+    /// <summary>
+    /// Generates a random integer between a specified inclusive lower bound and a
+    /// specified exclusive upper bound using a cryptographically strong random number generator.
+    /// </summary>
+    /// <param name="minValue">Inclusive min value</param>
+    /// <param name="maxValue">Exclusive max value</param>
+    /// <returns>A random number</returns>
     public override int Next(int minValue, int maxValue)
-    {
-        if (minValue > maxValue)
-            throw new ArgumentOutOfRangeException(nameof(maxValue));
-        if (minValue == maxValue)
-            return minValue;
-        var bytes = new byte[sizeof(int)];
-        _rng.GetBytes(bytes);
-        var sign = Math.Sign(BitConverter.ToInt32(bytes, 0));
-        return (sign * BitConverter.ToInt32(bytes, 0) % (maxValue - minValue)) + minValue;
-    }
+        => RandomNumberGenerator.GetInt32(minValue, maxValue);
 
     public long NextLong(long minValue, long maxValue)
     {