Make Device Location Name configuration (custom TZ) (#1031)

This permit to use arbitrary timezone (instead of UTC).

Useful for games like ACNH.

Ryujinx.Common/Configuration/ConfigurationFileFormat.cs

@@ -16,6 +16,11 @@ namespace Ryujinx.Configuration
 {
     public class ConfigurationFileFormat
     {
+        /// <summary>
+        /// The current version of the file format
+        /// </summary>
+        public const int CurrentVersion = 3;
+
         public int Version { get; set; }
 
         /// <summary>
@@ -78,6 +83,11 @@ namespace Ryujinx.Configuration
         /// </summary>
         public Region SystemRegion { get; set; }
 
+        /// <summary>
+        /// Change System TimeZone
+        /// </summary>
+        public string SystemTimeZone { get; set; }
+
         /// <summary>
         /// Enables or disables Docked Mode
         /// </summary>