removed unused or useless stuff,

renamed some functions for better description,
repaired the SettingsManager usage,
ToDo:
Dropdown list is not updated, it needs a restart,
display names for the directories instead of the path,

QtMeshViewer/Header/SettingsManager.h

@@ -22,8 +22,8 @@ public:
 
 // attributes
 private:
-	QFile file;
-	QString listOfDirs;
+	QFile m_file;
+	QStringList m_listOfDirs;
 
 	QVector3D m_bgColorOn = { 5, 5, 5 };
 	QVector3D m_bgColorOff = { 128, 204, 255 };
@@ -47,8 +47,7 @@ public:
 	bool isBfCulling() const;
 	bool isLight() const;
 
-	QString getListOfDirs();
-	void setListOfDirs(QString);
+	QStringList getListOfDirs();
 
 	int getLightType() const;
 	QVector3D getLightColor() const;
@@ -72,4 +71,5 @@ public:
 	void setHeadlight(bool value);
 	void setAutoColor(int value);
 
+	void updateDirectories(QString path);
 };