Change WXK_SPECIALx constants to follow the other WXK_XXX values

These constants were defined in the middle of the wxKeyCode enum, value-wise,
which made it difficult to end new elements to the enum as they could clash
with the existing ones if they were simply added at the end.

include/wx/defs.h

@@ -2676,7 +2676,7 @@ enum wxKeyCode
     WXK_COMMAND = WXK_CONTROL,
 
     /* Hardware-specific buttons */
-    WXK_SPECIAL1 = 193,
+    WXK_SPECIAL1 = WXK_WINDOWS_MENU + 2, /* Skip WXK_RAW_CONTROL if necessary */
     WXK_SPECIAL2,
     WXK_SPECIAL3,
     WXK_SPECIAL4,