added getter and setter for propertygrid
Merge remote-tracking branch 'origin/master' into PropetyGrid
Added event for elements
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
Added event to move elements in the previewPanel

Added/changed some tags in BarGraph, Graph
Added default construktor in PictureMarker
Merge remote-tracking branch 'origin/master' into PropetyGrid

Conflicts:
	Editor/Controller/EditorController/PreviewController.cs
fixed bug that each element has its own instance. uses cloning MAGIC!
Merge remote-tracking branch 'origin/master' into PropetyGrid
unnecessary...
changed centration of elements on the panel
Merge branch 'master'
changed getPreview from PictureMarker and ImageAugmention to show the actual Picture connected with them. Abstract2dAugmention added comment for width and heigth in mm