Uses cameraframe object to restore the last transformation of the camera (linked to issue #15)
Adapted CameraEntity type.
Removed unnecessary comment and println.
Now subscribing to LEVELADDED events.
Added Add Camera menu item ( issue #7 )
Setting the file location on the loaded level ( issue #17 )
Levels are not changed if they are not changed, more consideration for relative and absolute paths. (related to  issue #17 )
Added event type LEVELADDED and field level in the ProjectEvent class (related to  issue #17 )
Added field LEVELADDED (related to  issue #17 )
Moved isChanged to superclass. (related to issue #17)
Implemented isChanged and setChanged. (related to issue #17)