Rework machine diag:

- allways check for whole system state (all errors / warnings)
   -> e.g. an error does not hide an other error or warning
 - send machine event only once
 - store sent events in a QSet-container
 - clear this container if no error / warning is detected

Note: there is currently no message for releasing a certain single error
/ warning. So it is no worth in removing a single entry in
QSet-container. This is a task for later program versions.

src/ATBAPP/DeviceControllerDiag.h

@@ -2,6 +2,7 @@
 #define DEVICECONTROLLERDIAG_H
 
 #include <QObject>
+#include <QSet>
 #include <QTimer>
 
 #include "ATBMachineEvent.h"
@@ -78,17 +79,17 @@ private:
 
     QTimer *diagRequestTimeoutTimer;
 
-    //uint8_t sub_componentAssessment();
-    DeviceController::State sub_componentAssessment();
-    DeviceController::State sys_getSystemErrors();
+    void sub_componentAssessment(); // diag exit method
 
     int lastVoltage;
 
+    QSet<DeviceController::State> machineEventSet;
+
 private slots:
     void onDiagRequestTimeoutTimerTimeout();
 
-    void private_startDiag();                                   // diag entry method
-    void private_finishedDiag(DeviceController::State result);  // diag exit method
+    void private_startDiag();                                    // diag entry method
+    void private_sendDiagEvent(DeviceController::State result);
 
     void sys_superviseSystem();