Initial migration commit to .NET 7

Menu, sync and other stuff except resource system should be working.
We're far from finished

Client/Scripts/Menus/Sub/SettingsMenu.cs

@@ -1,6 +1,6 @@
 using System;
 using System.Drawing;
-using System.Windows.Forms;
+
 using GTA;
 using GTA.UI;
 using LemonUI.Menus;