New Sensor-> Actor -> Item system (half implemented, relay support

only), new ui, Relay dehardcoeding.

src/ui/relaywidget.h

@@ -0,0 +1,33 @@
+#ifndef RELAYWIDGET_H
+#define RELAYWIDGET_H
+
+#include <QWidget>
+#include "relaysettingsdialog.h"
+#include "relay.h"
+
+namespace Ui {
+class RelayWidget;
+}
+
+class RelayWidget : public QWidget
+{
+    Q_OBJECT
+private:
+    Relay* relay_;
+
+private slots:
+    void showSettingsDialog();
+
+public:
+    explicit RelayWidget(Relay* relay_, QWidget *parent = nullptr);
+    Relay* getRelay();
+    ~RelayWidget();
+
+public slots:
+    void stateChanged(bool state);
+
+private:
+    Ui::RelayWidget *ui;
+};
+
+#endif // RELAYWIDGET_H