UI: Option to automatically Hide UI when game launches (#462)

Quality of life feature
Similar in function to the "Start Games in Fullscreen" toggle
For users who want to run games in windowed/non-fullscreen mode with
menu UI hidden, this eliminates the need to always click "Hide UI"

src/Ryujinx/Utilities/Configuration/ConfigurationFileFormat.cs

@@ -17,7 +17,7 @@ namespace Ryujinx.Ava.Utilities.Configuration
         /// <summary>
         /// The current version of the file format
         /// </summary>
-        public const int CurrentVersion = 59;
+        public const int CurrentVersion = 60;
 
         /// <summary>
         /// Version of the configuration file format
@@ -351,6 +351,11 @@ namespace Ryujinx.Ava.Utilities.Configuration
         /// </summary>
         public bool StartFullscreen { get; set; }
 
+        /// <summary>
+        /// Start games with UI hidden
+        /// </summary>
+        public bool StartNoUI { get; set; }
+
         /// <summary>
         /// Show console window
         /// </summary>