Add Gyroscope support

We need a new class:QGyroscope as the base classe.
We need a readings class: QGyroscopeReading

We need the following properties available for QGyroscopeReading:
Angular velocity around the x axis.
Angular velocity around the y axis.
Angular velocity around the z axis.

All are measured as degrees (real,double or float - whatever fits your api best)

Output ranges for the above are:
x [-250..250;9]
y [-500..500;18]
z [-2000..2000;70]

Measurement frequency is [1..100]