disconnected magcal from core and put it all into hmc5883 driver. no need to keep track of it if driver does init by itself as well.
moved annexcode into mw.c instead of imu.c
hopefully didn't break anything.
NOT FLIGHT TESTED.

git-svn-id: https://afrodevices.googlecode.com/svn/trunk/baseflight@405 7c89a4a9-59b9-e629-4cfe-3a2d53b20e61