fix: set debug level to 2 on startup

Some plugins and devices are doing their own filtering based on the
debug level that's normally set using the `appdebug` console command.
On VC-4, there's no way to set that value. With this change, when
Essentials starts on a server, the debug level will be set to 2, so that
any of the messages that might be filtered based on the debug level
won't be filtered.

PepperDashEssentials/ControlSystem.cs

@@ -195,6 +195,8 @@ namespace PepperDash.Essentials
                 }
                 else   // Handles Linux OS (Virtual Control)
                 {
+                    Debug.SetDebugLevel(2);
+
                     Debug.Console(0, Debug.ErrorLogLevel.Notice, "Starting Essentials v{0} on Virtual Control Server", Global.AssemblyVersion);
 
                     // Set path to User/