Add other methods to compression dialog

Signed-off-by: SCell555 <kubci.rusnk645@gmail.com>
Co-Authored-By: Tino Reichardt <milky-7zip@mcmilk.de>

CPP/7zip/UI/Common/UpdateCallback.h

@@ -135,6 +135,10 @@ public:
   FString VolName;
   FString VolExt;
   UString ArcFileName; // without path prefix
+  FString VolPrefix;
+  FString VolPostfix;
+  bool VolNumberAfterExt;
+  UInt32 DigitCount;
 
   IUpdateCallbackUI *Callback;