Debugger: Implement notifications for debug info loading.

TeamDebugger:
- When notified that an image debug info job has started loading,
  notify the user interface accordingly. Also reset status to a ready
  state whenever all in-flight jobs are complete. This allows the
  user to know when then debug subsystem is still in the process
  of parsing debug information, as this can be time consuming for
  larger programs/libraries.

src/apps/debugger/controllers/TeamDebugger.h

@@ -140,6 +140,7 @@ private:
 
 	virtual	void				ImageDebugInfoJobNeedsUserInput(Job* job,
 									ImageDebugInfoLoadingState* state);
+	virtual	void				ImageDebugInfoJobInProgress(Image* image);
 
 	// Team::Listener
 	virtual	void				ThreadStateChanged(
@@ -235,6 +236,11 @@ private:
 			void				_NotifyUser(const char* title,
 									const char* text,...);
 
+			void				_ResetUserBackgroundStatusIfNeeded();
+									// updates user interface to
+									// ready/completed message
+									// for background work status
+
 private:
 			Listener*			fListener;
 			SettingsManager*	fSettingsManager;