refs #335, refs #342 improved simulator states

* new signal sending all 3 states together (connected, running, paused)
* renamed ISimulator::Status to ConnectionStatus
* consolidated some member / signal names
* for FS9/XPlane implemented stub functions

src/blackcore/simulator.cpp

@@ -13,4 +13,9 @@ namespace BlackCore
 {
     ISimulator::ISimulator(QObject *parent) : QObject(parent)
     { }
+
+    void ISimulator::emitSimulatorCombinedStatus()
+    {
+        emit simulatorStatusChanged(isConnected(), isRunning(), isPaused());
+    }
 }