removing of Engine-SDK updated in the editor

Terrain Textures: Changed tile sets are now appear in the UI
terrain texture is now also actualized in the 3d view
Level is now saved when changes were made

Changes in the terrain texture set fires undo-event
level toolbar displayed again and camera toolbar (from jme3) hidden
picking activated again, still throwing exceptions
painting terrain textures is working
some issues with the toolbar and terrain textures fixed
fixed issue #5
fixed issue #8
made camera more bird-like
fixed an issue that the extra toolbar is not removed in the scene viewer