Remove the user option to select NMEA sentences

[b-reyes]

In this PR I address #580. This PR removes the option that allows the user to select a subset of the GPS position sentences. It then ensures that we only select the NMEA sentences: ["GGA", "GLL", "RMC"] .

[leewujung]

@b-reyes : Thanks for the PR! Everything looks good and it's ready to be merged.

I only have a minor request: could you rename set_group_base._parse_NMEA() to something like _extract_NMEA_latlon() so that the function name describes more precisely the operations?

Feel free to merge afterwards. Thanks!

[codecov-commenter]

Codecov Report

Merging #778 (bd0273f) into dev (a020d71) will decrease coverage by 7.22%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##              dev     #778      +/-   ##
==========================================
- Coverage   82.38%   75.16%   -7.23%     
==========================================
  Files          48       15      -33     
  Lines        4264     2416    -1848     
==========================================
- Hits         3513     1816    -1697     
+ Misses        751      600     -151     

Flag	Coverage Δ
unittests	75.16% <100.00%> (-7.23%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
echopype/convert/api.py	84.55% <ø> (-0.23%)	⬇️
echopype/convert/set_groups_base.py	88.42% <100.00%> (-2.01%)	⬇️
echopype/convert/set_groups_ek60.py	92.03% <100.00%> (ø)
echopype/convert/set_groups_ek80.py	96.57% <100.00%> (ø)
echopype/convert/utils/ek_raw_parsers.py	54.90% <0.00%> (-0.17%)	⬇️
echopype/echodata/widgets/widgets.py
echopype/utils/prov.py
...echodata/sensor_ep_version_mapping/v05x_to_v06x.py
... and 30 more

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