Replace timeago

[FedericoCeratto]

Replace the timeago library with a simple function. This reduces the amount of Python dependencies making the tool easier to package for Linux distributions. Additionally it handles unexpected timestamps from the future, if any, by returning None

[codecov]

Codecov Report

Attention: Patch coverage is 78.57143% with 3 lines in your changes missing coverage. Please review.

Project coverage is 61.37%. Comparing base (b58094b) to head (b055813).

❗ Current head b055813 differs from pull request most recent head c34d08b

Please upload reports for the commit c34d08b to get more accurate results.

Files	Patch %	Lines
meshtastic/mesh_interface.py	78.57%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #587      +/-   ##
==========================================
- Coverage   61.78%   61.37%   -0.42%     
==========================================
  Files          14       14              
  Lines        2986     2985       -1     
==========================================
- Hits         1845     1832      -13     
- Misses       1141     1153      +12     

Flag	Coverage Δ
unittests	61.37% <78.57%> (-0.42%)	⬇️

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[ianmcorvidae]

I think that this largely looks fine to me, and I certainly like getting rid of dependencies and creating more code we can properly add types to (and already have, basically). If you're able to, I do think I would like to see some tests of this code, since by no longer relying on an external library we're probably slightly more responsible for ensuring the output is sane! I suspect this code would also be likely to be moved around by #579, but that is of course still in planning stages, just noting here for good measure.

[FedericoCeratto]

@ianmcorvidae Rebased and updated with tests and some cleanup

[ianmcorvidae]

I fixed up pylint complaining about a lack of a docstring, and added a test using fuzzing (just for fun, really, I've been learning how to use that library recently) and merged. Thanks for the contribution!