Add a minimalistic implementation of Euler Deconvolution

[Souza-junior]

Implementation of a minimalist implementation of Euler Deconvolution, accompanied by tests for magnetic and gravimetric data. The tests also include analyses with varying base levels and derivatives calculated analytically and via FFT.

Fixes #268

Relevant issues/PRs:

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[leouieda]

@Souza-junior congratulations! This was a really nice contribution and sorry it took so long to merge. Please add yourself to the AUTHORS.md file as soon as possible so you can be listed as an author in the next release.