System Time Offset Implementation (#1101)

* System Time Offset Implementation

* Addressed @Thog's comments

* Addressed JD's comments

* Addressed @Thog's and @AcK77's comments

* formatting correction

Ryujinx.Common/Configuration/ConfigurationFileFormat.cs

@@ -19,7 +19,7 @@ namespace Ryujinx.Configuration
         /// <summary>
         /// The current version of the file format
         /// </summary>
-        public const int CurrentVersion = 4;
+        public const int CurrentVersion = 5;
 
         public int Version { get; set; }
 
@@ -93,6 +93,11 @@ namespace Ryujinx.Configuration
         /// </summary>
         public string SystemTimeZone { get; set; }
 
+        /// <summary>
+        /// Change System Time Offset in seconds
+        /// </summary>
+        public long SystemTimeOffset { get; set; }
+
         /// <summary>
         /// Enables or disables Docked Mode
         /// </summary>