src: refactored UI elements and graphics file structure

* split QtIconButton into multiple files
* moved graph elements from view to graphics
* structured elements into sub directories

src/lib_gui/qt/element/button/QtHelpButton.h

@@ -0,0 +1,22 @@
+#ifndef QT_HELP_BUTTON_H
+#define QT_HELP_BUTTON_H
+
+#include "QtIconButton.h"
+
+class QtHelpButton
+	: public QtIconButton
+{
+	Q_OBJECT
+
+public:
+	QtHelpButton(const QString& helpTitle, const QString& helpText, QWidget* parent = nullptr);
+
+private slots:
+	void handleHelpPress();
+
+private:
+	QString m_helpTitle;
+	QString m_helpText;
+};
+
+#endif // QT_HELP_BUTTON_H