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/BlockFile.h

@@ -133,6 +133,7 @@ class BlockFile {
  private:
 
    friend class DirManager;
+   friend class AudacityApp;
    //needed for Ref/Deref access.
    friend class ODComputeSummaryTask;
    friend class ODDecodeTask;