the great sensor orientation unfucking work in progress part 2.
fixed MMA8452 orientation, as well as mag calculations.
gyro/mag is still reversed on Z, DO NOT FLY.

git-svn-id: https://afrodevices.googlecode.com/svn/trunk/baseflight@398 7c89a4a9-59b9-e629-4cfe-3a2d53b20e61
fixing mag heading. DO NOT FLY!

git-svn-id: https://afrodevices.googlecode.com/svn/trunk/baseflight@399 7c89a4a9-59b9-e629-4cfe-3a2d53b20e61