* Removed constructors where unnecessary
+ Added convenience method in API main class
+ Added listener for messages
+ Added listener for images
* Changed APIFormation, is a normal class now
+ Added functionality to get actual and target movement data of
quadcopters
- Removed Status, replaced with isTracked() : Boolean
+ Added listener vor quadcopter changes
+ Added methods to get quadcopters in different states
+ Added methods to get calibrated and not calibrated cameras
+ Added listener for cameras
+ Added methods for launching and landing
+ Added method for shutting down the system
+ Added methods for getting physical capabilities of the quadcopters
+ Added a bunch of parameters, not finished

* A bunch of other stuff I forgot.
Merge branch 'master' of https://github.com/KITrokopter/UML