Syncshells (#11)

* some groups stuff

* further groups rework

* fixes for pause changes

* adjsut timeout interval

* fixes and namespace change to file scoped

* more fixes

* further implement groups

* fix change group ownership

* add some more stuff for groups

* more fixes and additions

* some fixes based on analyzers, add shard info to ui

* add discord command, cleanup

* fix regex

* add group migration and deletion on user deletion

* add api method for client to check health of connection

* adjust regex for vanity

* fixes for server and bot

* fixes some string comparison in linq queries

* fixes group leave and sets alias to null

* fix syntax in changeownership

* add better logging, fixes for group leaving

* fixes for group leave

Co-authored-by: Stanley Dimant <root.darkarchon@outlook.com>

MareSynchronosServer/MareSynchronosShared/Utils/StringUtils.cs

@@ -0,0 +1,31 @@
+using System.Security.Cryptography;
+using System.Text;
+
+namespace MareSynchronosShared.Utils;
+
+public static class StringUtils
+{
+    public static string GenerateRandomString(int length, string? allowableChars = null)
+    {
+        if (string.IsNullOrEmpty(allowableChars))
+            allowableChars = @"ABCDEFGHJKLMNPQRSTUVWXYZ0123456789";
+
+        // Generate random data
+        var rnd = RandomNumberGenerator.GetBytes(length);
+
+        // Generate the output string
+        var allowable = allowableChars.ToCharArray();
+        var l = allowable.Length;
+        var chars = new char[length];
+        for (var i = 0; i < length; i++)
+            chars[i] = allowable[rnd[i] % l];
+
+        return new string(chars);
+    }
+
+    public static string Sha256String(string input)
+    {
+        using var sha256 = SHA256.Create();
+        return BitConverter.ToString(sha256.ComputeHash(Encoding.UTF8.GetBytes(input))).Replace("-", "", StringComparison.OrdinalIgnoreCase);
+    }
+}