fix some changes in removeShit
Merge https://github.com/Firebusa/ARdevKit into PreviewTest
Added comment
fix bugs
Merge https://github.com/Firebusa/ARdevKit into PreviewTest
Merge branch 'PreviewTest'

fix some bugs, add contextmenu to remove objects, show sources + remove sources
fix some bugs,

change funktion of SceneSelectionPanel
Changed IDMarker and PictureMarker to use MarkerFuser
Merge branch 'master' of https://github.com/Firebusa/ARdevKit
fix SceneSelectionPanel
Merge branch 'master' of https://github.com/Firebusa/ARdevKit
Merge branch 'master'