added getter and setter for propertygrid
Merge remote-tracking branch 'origin/master' into PropetyGrid
reorganized some code
changed a condition, lizzard wanted this...
Added possibility to set the position of a chart  (relative to screen)
Added event for elements
added private void clearControllers()
modified updateElementSelectionPanel so that initialize empty project works properly
Merge branch 'EditorWindow' of https://github.com/Firebusa/ARdevKit.git
changed public void updateElementSelectionPanel()
implemented createNewProject(String name)
implemented save method
changed file extenstion
Merge remote-tracking branch 'origin/master'

fix some bugs
Merge branch 'master' of https://github.com/Firebusa/ARdevKit
Changed some tags in AbstractMarker, AbstractTrackable, IDMarker, PictureMarker

Deleted similarityThreshold in PictureMarker, becaus it is already in AbstractTrackable
Added FileSelectorTypeEditor for openFileDialog when changing image of image Marker
Merge remote-tracking branch 'origin/master' into PropetyGrid
Merge branch 'master' of https://github.com/Firebusa/ARdevKit.git
changed save method & implemented load method
Added event to move elements in the previewPanel

Added/changed some tags in BarGraph, Graph
Added default construktor in PictureMarker