Fixed MSVS build. Added plugin icons, improved UI.

core/iplugin.h

@@ -6,6 +6,7 @@
 #include <QtPlugin>
 #include <QJsonObject>
 #include <QStringList>
+#include <QIcon>
 
 #include "service.h"
 #include "igridform.h"
@@ -70,6 +71,10 @@ public:
         return (Service<T>*)m_service;
     }
 
+    virtual QIcon pluginIcon() {
+        return QIcon();
+    }
+
 protected:
     QWidget *m_ui;
     QWidget *m_settingsUi;