Fix.
Fix.
Merge branch 'master' of https://github.com/wilbert-alberts/PiControl

Conflicts:
	Servo/src/SPI.cpp
Fix SPI communication. Alignment of 16 bit fields in struct.
Add HPF filter device. Add Accelerometer device
Fix: all SPI devices made to 16 bit unsigned

	Leads to Gyro data provided by signal and reference.
	Introduced Difference device.