Velocity based gain adjustment based on dynamic presssure

Update servo arm only on real change.

Accelerometer calibration bugfix

6point accel calibration

Still threshold increased to 0.1m/s^2, and orientation error threshold to 5m/s^2. Timeout increased to 30s.

mkblctrl: some small fixes

Help Parameter added and some small fixes. This Version was flown several Hours without any Problems.

Mikrokopter BLCtrl driver mkblctrl

BLCtrl 2.0 testing - currently only 8 Bit resolution - motor detection and px4 mode as default - with safety shutdown - fix

BLCtrl 2.0 testing - currently only 8 Bit resolution - motor detection and px4 mode as default - with safety shutdown

Add support for quads with offset arms such as the TBS Discovery

Small change in gps-driver (ubx.cpp)

GPS didn't work before this change was made