[moveonly] Extract HelpRequested to dry up the help options testing

This ensures consistency across interfaces and makes the version handling more clear.

src/util.cpp

@@ -584,7 +584,10 @@ void ArgsManager::ForceSetArg(const std::string& strArg, const std::string& strV
     mapMultiArgs[strArg] = {strValue};
 }
 
-
+bool HelpRequested(const ArgsManager& args)
+{
+    return args.IsArgSet("-?") || args.IsArgSet("-h") || args.IsArgSet("-help");
+}
 
 static const int screenWidth = 79;
 static const int optIndent = 2;