some refactoring

* massive changes inside includes, drop unused definitions
* rewrite some initialization methods to avoid additional
freeing/allocation
* drop some explicit destructors calls

sources/awesome-widget/plugin/awdataaggregator.h

@@ -35,7 +35,6 @@ class AWDataAggregator : public QObject
 public:
     explicit AWDataAggregator(QObject *_parent = nullptr);
     virtual ~AWDataAggregator();
-    QList<float> getData(const QString &_key) const;
     QString htmlImage(const QPixmap &_source) const;
     void setParameters(const QVariantMap &_settings);
     QPixmap tooltipImage();