WiP: Add moving average filters#3

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nicoonoclaste wants to merge 3 commits intoMichaelMauderer:developfrom

nicoonoclaste:ewma

Commits on Dec 3, 2019

Add moving_averages module (initially, only a naive EWMA)
nicoonoclaste
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Commits on Dec 6, 2019

moving_averages::regular::ExponentialWMA::update return new estimate
nicoonoclaste
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Commits on Dec 9, 2019

moving_averages::regular: Add Jambon's adaptive average (WiP)
nicoonoclaste
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