fix: Adds server access with protected accounts (#915)

Adds a configuration file to specify protected accounts:
_Distribution/Configuration/server-access.json_
```json
{
  "newPasswordOnReset": false,
  "protectedAccounts": ["admin"]
}
```

Protected accounts are unbanned and reset to `AccessLevel.Owner` upon login.

The option `newPasswordOnReset` will create a new password for a protected account if it needs to be reset. The password is a random GUID and logged to the console.

_**Note:**_ If your player character was accidentally modified, simply make a new character to fix the old one.

Projects/UOContent/Misc/PacketThrottles.cs

@@ -10,7 +10,7 @@ namespace Server.Network
     {
         // Delay in milliseconds
         private static readonly int[] Delays = new int[0x100];
-        private static string ThrottlesConfiguration = "Configuration/throttles.json";
+        private const string ThrottlesConfiguration = "Configuration/throttles.json";
 
         public static void Initialize()
         {