AppleII - don't savestate unneeded AV buffers.

ExternalCoreProjects/Virtu/Services/AudioService.cs

@@ -22,9 +22,17 @@ namespace Jellyfish.Virtu.Services
 			}
         }
 
+		[Newtonsoft.Json.JsonIgnore] // only relevant if trying to savestate midframe
 		private short[] buff = new short[4096];
+		[Newtonsoft.Json.JsonIgnore] // only relevant if trying to savestate midframe
 		private int pos = 0;
 
+		[System.Runtime.Serialization.OnDeserialized]
+		public void OnDeserialized(System.Runtime.Serialization.StreamingContext context)
+		{
+			pos = 0;
+		}
+
 		public void Clear()
 		{
 			pos = 0;

ExternalCoreProjects/Virtu/Services/VideoService.cs

@@ -14,6 +14,7 @@
 			this.fb = fb;
 		}
 
+		[Newtonsoft.Json.JsonIgnore] // client can serialize framebuffer if it wants to
 		public int[] fb;
 
 		public void SetPixel(int x, int y, int color)

ExternalCoreProjects/Virtu/Video.cs

@@ -25,6 +25,12 @@ namespace Jellyfish.Virtu
             };
         }
 
+		[System.Runtime.Serialization.OnDeserialized]
+		public void OnDeserialized(System.Runtime.Serialization.StreamingContext context)
+		{
+			DirtyScreen();
+		}
+
         public override void Initialize()
         {
             _memory = Machine.Memory;