Build as Self Contained and Selfhost CefSharp SubProcess (#693)

* Added self contained parameter to builds

* Remove dotnet install from installer

* Fixed missing SubProcessExe

* Self hot browser subprocess

---------

Co-authored-by: Natsumi <cmcooper123@hotmail.com>

Dotnet/Cef/SubProcess.cs

@@ -0,0 +1,54 @@
+using CefSharp.Internals;
+using System;
+using System.IO;
+
+namespace VRCX;
+
+public class BrowserSubprocess
+{
+    /// <summary>
+    /// This function should be called from the application entry point function (typically Program.Main)
+    /// to execute a secondary process e.g. gpu, renderer, utility
+    /// This overload is specifically used for .Net Core. For hosting your own BrowserSubProcess
+    /// it's preferable to use the Main method provided by this class.
+    /// - Pass in command line args
+    /// </summary>
+    /// <param name="args">command line args</param>
+    /// <returns>
+    /// If called for the browser process (identified by no "type" command-line value) it will return immediately
+    /// with a value of -1. If called for a recognized secondary process it will block until the process should exit
+    /// and then return the process exit code.
+    /// </returns>
+    public static void Start()
+    {
+        var args = Environment.GetCommandLineArgs();
+        var type = CommandLineArgsParser.GetArgumentValue(args, CefSharpArguments.SubProcessTypeArgument);
+
+        if (string.IsNullOrEmpty(type))
+        {
+            // If --type param missing from command line CEF/Chromium assums
+            // this is the main process (as all subprocesses must have a type param).
+            return;
+        }
+        
+        var browserSubprocessDllPath = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "CefSharp.BrowserSubprocess.Core.dll");
+        if (!File.Exists(browserSubprocessDllPath))
+        {
+            browserSubprocessDllPath = Path.Combine(Path.GetDirectoryName(typeof(CefSharp.Core.BrowserSettings).Assembly.Location), "CefSharp.BrowserSubprocess.Core.dll");
+        }
+        var browserSubprocessDll = System.Runtime.Loader.AssemblyLoadContext.Default.LoadFromAssemblyPath(browserSubprocessDllPath);
+        var browserSubprocessExecutableType = browserSubprocessDll.GetType("CefSharp.BrowserSubprocess.BrowserSubprocessExecutable");
+
+        var browserSubprocessExecutable = Activator.CreateInstance(browserSubprocessExecutableType);
+
+        var mainMethod = browserSubprocessExecutableType.GetMethod("MainSelfHost", System.Reflection.BindingFlags.Static | System.Reflection.BindingFlags.Public);
+        var argCount = mainMethod.GetParameters();
+
+        var methodArgs = new object[] { args };
+
+        var exitCode = mainMethod.Invoke(null, methodArgs);
+
+        Environment.Exit((int)exitCode);
+    }
+}
+