Update interface: DeviceControllerInterface is derived from QObject:

This is for using new connect()-syntax in main application.
Note:
 - signals in interface must not be defined virtual
 - signals in implementation must not override signals defined
   in interface.

src/ATBAPP/ATBDeviceControllerPlugin.cpp

@@ -14,9 +14,11 @@
 
 
 
-ATBDeviceControllerPlugin::ATBDeviceControllerPlugin(QObject *parent) : QObject(parent),
+ATBDeviceControllerPlugin::ATBDeviceControllerPlugin(QObject *parent) :
     pluginState(PLUGIN_STATE::NOT_INITIALIZED)
 {
+    this->setParent(parent);
+
     this->pluginInfo = QString::fromUtf8(pluginInfoString.c_str());
 
     if (!this->private_loadCashAgentLib("")) {