Get rid of obsolete magnetometer processing
Merge pull request #14 from yashunsky/wp/refactoring/12

Get rid of obsolete magnetometer processing
>> I'm not really sure, that MAGNET_OFFSET is a real constant to be put at the top: it is used to translate a non-symmeric normalized area [0..1] into a symmetric one. So putting it into a constant is nearly the same as having a const MAGNET_MAX = 1, for a normalized value, but let it bee