Allow to assign BackPanel keys to X360 controller (breaks all current configs to set mappings)

SteamController/ProfilesSettings/VirtualX360Code.cs

@@ -0,0 +1,24 @@
+namespace SteamController.ProfilesSettings
+{
+    public enum VirtualX360Code
+    {
+        None = 0,
+
+        X360_UP,
+        X360_DOWN,
+        X360_LEFT,
+        X360_RIGHT,
+        X360_BACK,
+        X360_START,
+
+        X360_A,
+        X360_B,
+        X360_X,
+        X360_Y,
+
+        X360_LB,
+        X360_RB,
+        X360_LS,
+        X360_RS
+    }
+}