Merge overlays, move overlay to separate process (#44)

* refactor: merge two overlay offScreenBrowser into one

* Electron support for shared overlay

* Separate overlay into its own process

* fix: invalid overlay texture size

* Handle duplicate processes

* Remove logging

---------

Co-authored-by: pa <maplenagisa@gmail.com>
Co-authored-by: rs189 <35667100+rs189@users.noreply.github.com>

Dotnet/Overlay/Cef/OverlayProgram.cs

@@ -0,0 +1,51 @@
+using System;
+using System.Threading.Tasks;
+using System.Windows.Forms;
+using NLog;
+
+namespace VRCX.Overlay;
+
+internal static class OverlayProgram
+{
+    private static readonly Logger logger = LogManager.GetCurrentClassLogger();
+    
+    public static VRCXVRInterface VRCXVRInstance;
+    
+    public static void OverlayMain()
+    {
+        logger.Info("VRCX Overlay starting...");
+        CefService.Instance.Init();
+        AppApiVr.Instance = new AppApiVrCef();
+        var isLegacy = VRCXStorage.Instance.Get("VRCX_DisableVrOverlayGpuAcceleration") == "true";
+        VRCXVRInstance = new VRCXVRCef(isLegacy);
+        VRCXVRInstance.Init();
+        
+        OverlayClient.Init();
+
+        logger.Info("VRCX Overlay started...");
+        QuitProcess();
+        ApplicationConfiguration.Initialize();
+        var context = new ApplicationContext();
+        Application.Run(context);
+        Exit();
+    }
+
+    private static void Exit()
+    {
+        logger.Info("VRCX Overlay exiting...");
+        // CefService.Instance.Exit();
+        OverlayClient.Exit();
+        VRCXVRInstance.Exit();
+        Environment.Exit(0);
+    }
+
+    private static async Task QuitProcess()
+    {
+        await Task.Delay(5000);
+        while (OverlayClient.ConnectedAndActive)
+        {
+            await Task.Delay(500);
+        }
+        Exit();
+    }
+}