Enhancement - confirm3

- Added a tri-state confirmation function for confirming bulk operations
  allowing the user to answer yes/no/all to and optionally allow,
  disallow or bulk-allow big changes.

src/util.h

@@ -51,6 +51,7 @@ for (typeof (c) *foreach_p = & (c);                                \
 
 // util.cpp
 bool confirm (const std::string&);
+int confirm3 (const std::string&);
 void delay (float);
 std::string formatSeconds (time_t);
 std::string formatSecondsCompact (time_t);