Add Enum to handle meta keys on Mac OS

Part of the rb 120323

René J.V. Bertin rjvberti @gmai .com

(cherry picked from commit b2cf60009e)

src/Session.h

@@ -51,6 +51,17 @@ class TerminalDisplay;
 class ZModemDialog;
 class HistoryType;
 
+/**
+ * Platform-specific main shortcut "opcode":
+ */
+enum Modifier {
+#ifdef Q_OS_MAC
+    ACCEL = Qt::META
+#else
+    ACCEL = Qt::CTRL
+#endif
+};
+
 /**
  * Represents a terminal session consisting of a pseudo-teletype and a terminal emulation.
  * The pseudo-teletype (or PTY) handles I/O between the terminal process and Konsole.