LinkJVM 2.1.0

***New package structure***
The high package has been removed, the content is now directly stored in the `linkjvm` package.
The new imports are: 
```java
import linkjvm.ardrone
import linkjvm.create
import linkjvm.debugger
import linkjvm.motors
import linkjvm.sensors
import linkjvm.vision
(...)
```

***Other changes***

Additions:
+ added `Botball` class with many useful helper methods
+ added create sensors
+ added `update method to camera`
+ added experimental depth support


Changes:
+ InvalidPortException is now a RuntimeException
+ added kar-gen for generating kar archives via SSH
+ fixed create constructor
+ fixed `DigitalSensor` return value
+ set the right camera resolution
+ motor's `turn` method is now deprecated, you should use `run` instead
+ rename the `Object` class to `CameraObject`