gui: Refactoring Part 1 (#1859)

* gui: Refactoring Part 1

* Fix ProfileDialog.glade path

* Fix Application.Quit assert

* Fix TitleUpdateWindow parent

* Fix TitleUpdate selected item

* Remove extra line in TitleUpdateWindow

* Fix empty assign of Enum.TryParse

* Add Patrons list in the About Window

* update about error messages

Ryujinx/Ui/Windows/AboutWindow.cs

@@ -0,0 +1,73 @@
+using Gtk;
+using Ryujinx.Common.Utilities;
+using Ryujinx.Ui.Helper;
+using System.Net.Http;
+using System.Net.NetworkInformation;
+using System.Threading.Tasks;
+
+namespace Ryujinx.Ui.Windows
+{
+    public partial class AboutWindow : Window
+    {
+        public AboutWindow() : base($"Ryujinx {Program.Version} - About")
+        {
+            InitializeComponent();
+
+            _ = DownloadPatronsJson();
+        }
+
+        private async Task DownloadPatronsJson()
+        {
+            if (!NetworkInterface.GetIsNetworkAvailable())
+            {
+                _patreonNamesText.Buffer.Text = "Connection Error.";
+            }
+
+            HttpClient httpClient = new HttpClient();
+
+            try
+            {
+                string patreonJsonString = await httpClient.GetStringAsync("https://patreon.ryujinx.org/");
+
+                _patreonNamesText.Buffer.Text = string.Join(", ", JsonHelper.Deserialize<string[]>(patreonJsonString));
+            }
+            catch
+            {
+                _patreonNamesText.Buffer.Text = "API Error.";
+            }
+        }
+
+        //
+        // Events
+        //
+        private void RyujinxButton_Pressed(object sender, ButtonPressEventArgs args)
+        {
+            OpenHelper.OpenUrl("https://ryujinx.org");
+        }
+
+        private void PatreonButton_Pressed(object sender, ButtonPressEventArgs args)
+        {
+            OpenHelper.OpenUrl("https://www.patreon.com/ryujinx");
+        }
+
+        private void GitHubButton_Pressed(object sender, ButtonPressEventArgs args)
+        {
+            OpenHelper.OpenUrl("https://github.com/Ryujinx/Ryujinx");
+        }
+
+        private void DiscordButton_Pressed(object sender, ButtonPressEventArgs args)
+        {
+            OpenHelper.OpenUrl("https://discordapp.com/invite/N2FmfVc");
+        }
+
+        private void TwitterButton_Pressed(object sender, ButtonPressEventArgs args)
+        {
+            OpenHelper.OpenUrl("https://twitter.com/RyujinxEmu");
+        }
+
+        private void ContributorsButton_Pressed(object sender, ButtonPressEventArgs args)
+        {
+            OpenHelper.OpenUrl("https://github.com/Ryujinx/Ryujinx/graphs/contributors?type=a");
+        }
+    }
+}