ProjectExplorer: Introduce DeviceProcessSignalOperation.

Every device can now return a DeviceProcessSignalOperation,
which allows to kill or interrupt processes running on the
device.

Change-Id: Idaa04ebc767e09ca167fa033ed93860b9b81479e
Reviewed-by: Christian Kandeler <christian.kandeler@digia.com>
Reviewed-by: David Kaspar <dkaspar@blackberry.com>
Reviewed-by: hjk <hjk121@nokiamail.com>

src/plugins/android/androiddevice.h

@@ -47,6 +47,7 @@ public:
     QString displayNameForActionId(Core::Id actionId) const;
     void executeAction(Core::Id actionId, QWidget *parent = 0);
     bool canAutoDetectPorts() const;
+    ProjectExplorer::DeviceProcessSignalOperation::Ptr signalOperation() const;
 
     ProjectExplorer::IDevice::Ptr clone() const;