ProjectExplorer: Unify RunControl setup/teardown

Provide protected methods in RunControl to handle the notification
of when the RunControl starts and stops. Use these helpers to
move the isRunning() method into the RunConfiguration itself instead
of reimplementing it everywhere.

Change-Id: Ia8de42f7a6a14a049870d4e7fcb9af6756c2caa4
Reviewed-by: Maurice Kalinowski <maurice.kalinowski@qt.io>
Reviewed-by: hjk <hjk@qt.io>
Reviewed-by: Ulf Hermann <ulf.hermann@qt.io>
Reviewed-by: Christian Kandeler <christian.kandeler@qt.io>
Reviewed-by: Tim Jenssen <tim.jenssen@qt.io>

src/plugins/debugger/debuggerruncontrol.h

@@ -69,7 +69,6 @@ public:
     void start() override;
     bool promptToStop(bool *prompt = 0) const override;
     StopResult stop() override; // Called from SnapshotWindow.
-    bool isRunning() const override;
     QString displayName() const override;
     bool supportsReRunning() const override;
     void handleApplicationOutput(const QString &msg, int channel);
@@ -104,7 +103,6 @@ private:
                        Internal::DebuggerEngine *engine);
 
     Internal::DebuggerEngine *m_engine;
-    bool m_running;
     OutputProcessor *m_outputProcessor = 0;
 };