Deleted mightyboard and gyro test 2

Removed obsolete files:
hitechnic-gyro-test2.c
mightyboard.h
HiTechnic Angle

make use of cross platform getXbuttonValue()
Fix typo in driver comment
Removed all old code that was commented out
HiTechnic Gyro sensor

API changed to new style
Fixed some typos in de code
HiTechnic Gyro

Accidentally forgot add this file to previous commit
Fixed some typos in driver that were for another driver
HiTechnic Magnetic Sensor

API changed to new style
HiTechnic Compass

Removed old commented out code
Common.h

Added cross platform button function getXbuttonValue()