Debugger: Make DebuggerRunTool (more) responsible for output

Make DebuggerRunTool accessible to downstream users, but remove
the non-standard handleApplicationOutput from the run control
itself to move it closer to the base run control.

LogChannel and Utils::OutputFormat should merge at some time.

Change-Id: I47b0f0067e1427b25e47036c3d4bc6ed5eed6189
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

src/plugins/debugger/debuggerruncontrol.h

@@ -53,7 +53,6 @@ public:
     void start() override;
     bool promptToStop(bool *prompt = 0) const override;
     void stop() override; // Called from SnapshotWindow.
-    void handleApplicationOutput(const QString &msg, int channel);
 
     void startFailed();
     void notifyEngineRemoteServerRunning(const QByteArray &msg, int pid);