Enhancement - Subst and Keymap

- Implemented Subst object and mored it into place ready for integration.
- Moved skeleton Keymap into place.  Not implemented yet.

src/Keymap.h

@@ -0,0 +1,51 @@
+////////////////////////////////////////////////////////////////////////////////
+// task - a command line task list manager.
+//
+// Copyright 2006 - 2009, Paul Beckingham.
+// All rights reserved.
+//
+// This program is free software; you can redistribute it and/or modify it under
+// the terms of the GNU General Public License as published by the Free Software
+// Foundation; either version 2 of the License, or (at your option) any later
+// version.
+//
+// This program is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+// FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+// details.
+//
+// You should have received a copy of the GNU General Public License along with
+// this program; if not, write to the
+//
+//     Free Software Foundation, Inc.,
+//     51 Franklin Street, Fifth Floor,
+//     Boston, MA
+//     02110-1301
+//     USA
+//
+////////////////////////////////////////////////////////////////////////////////
+#ifndef INCLUDED_KEYMAP
+#define INCLUDED_KEYMAP
+
+#include <string>
+
+class Keymap
+{
+public:
+  Keymap ();                         // Default constructor
+  Keymap (const Keymap&);            // Copy constructor
+  Keymap& operator= (const Keymap&); // Assignment operator
+  ~Keymap ();                        // Destructor
+
+  void load (const std::string&);    // Load the map file
+/*
+  real ();                           // Convert soft to real
+  soft ();                           // Convert real to soft
+*/
+
+private:
+  // TODO Structure for mapping strings to keys.
+};
+
+#endif
+////////////////////////////////////////////////////////////////////////////////