MAJOR wavReadFourier restructuring

-- System is now more based on checking if data was already calculating.
This can be checked, rather than always recalculating the data.
-- maxfrequencyclean was slightly changed to adapt to the new and
improved wavReadFourier
-- rangeRateClass was changed quite a lot to adapt. Plotting now takes
less time due to the fact that data is reused instead of recalculated