Functional change: The directions are now handled uniformly, and motors
pointing along a given axis _in both directions_ are classified as
pointing along that axis. The names are changed accordingly:
- longitudinal = forward and backward
- lateral = left and right
- vertical = up and down
Cosmetic / maintainability changes:
- rather than repeating the function for each direction, the same code
now handles all directions
- the bitmasks are now in a struct, so we can pass them around together,
avoiding the need for every single effectivenss class to manually set
the three masks.
- reorder in some places to always match x-y-z
Balduin
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