Bug 330 (P2) - Fix an issue where multiple projects would cause the warning dialogs to pop up above the wrong project.

I refactored the code into AudacityApp with a new timer.  This is provisional pending discussion - if it is decided that it should go somewhere else I will move it.

src/AudioIO.h

@@ -306,31 +306,6 @@ class AUDACITY_DLL_API AudioIO {
     */
    static bool ValidateDeviceNames(wxString play, wxString rec);
 
-   /** \brief Mark playback as having missing aliased blockfiles
-     *
-     * Playback will continue, but the missing files will be silenced
-     * ShouldShowMissingAliasedFileWarning can be called to determine
-     * if the user should be notified
-     */
-   void MarkAliasedFilesMissingWarning();
-
-   /** \brief Changes the behavior of missing aliased blockfiles warnings
-     */
-   void SetMissingAliasedFileWarningShouldShow(bool b);
-   
-   /** \brief Returns true if the user should be notified of missing alias warnings
-     */
-   bool ShouldShowMissingAliasedFileWarning();
-   
-   /** \brief Sets the wxDialog that is being displayed 
-     * Used by the custom dialog warning constructor and destructor
-     */
-   void SetMissingAliasFileDialog(wxDialog *dialog);
-   
-   /** \brief returns a pointer to the wxDialog if it is displayed, NULL otherwise.
-     */
-   wxDialog *GetMissingAliasFileDialog();
-
    /** \brief Function to automatically set an acceptable volume
     *
     */
@@ -535,10 +510,6 @@ private:
    volatile bool       mAudioThreadFillBuffersLoopRunning;
    volatile bool       mAudioThreadFillBuffersLoopActive;
 
-   bool                m_aliasMissingWarningShouldShow;
-   bool                m_aliasMissingWarning;
-   wxDialog            *m_aliasMissingWarningDialog;
-
 #ifdef EXPERIMENTAL_MIDI_OUT
    volatile bool       mMidiThreadFillBuffersLoopRunning;
    volatile bool       mMidiThreadFillBuffersLoopActive;