[DRAFT - DO NOT MERGE] Switch out accelerometer for magnetometer #575
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microbit-robert
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This branch is for testing purposes only and adds the ability to record data using the magnetometer and includes a new filter which seems to try and help the model differentiate between left and right swiping motions over the top of the micro:bit with a magnetic object. The filter attempts to get the first significant change in gradient and output the signed vector of this gradient.
The magnetometer data is rescaled to -1..1. As accelerometer data is not available in this branch, there is no need for the scales to be consistent.
This branch has pulled in relevant changes from #268.