Fixes for bugs 1122 and 1113

Several other issues were also fixed (hopefully ;-)).

This is a major change to accelerator handling and keyboard
capturing.  Menu shortcuts, non-menu commands, label editing,
navigation, and basically anything else were you might use
the keyboard should be thoroughly tested.

src/AudacityApp.h

@@ -118,13 +118,6 @@ class AudacityApp:public wxApp {
 
    void OnEndSession(wxCloseEvent & event);
 
-   void OnKeyDown(wxKeyEvent & event);
-   void OnChar(wxKeyEvent & event);
-   void OnKeyUp(wxKeyEvent & event);
-
-   void OnCaptureKeyboard(wxCommandEvent & event);
-   void OnReleaseKeyboard(wxCommandEvent & event);
-
    // Most Recently Used File support (for all platforms).
    void OnMRUClear(wxCommandEvent &event);
    void OnMRUFile(wxCommandEvent &event);