Added DOP functionality

[danineamati]

Changes:

1. Convert elevation and azimuth to ENU unit vectors
2. Compute DOP for NavDatas with elevation and azimuth data
3. Patched bug where NavData and Visualizations modules were not in ReadTheDocs.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (c2b2b2f) 99.55% compared to head (ad8eb85) 99.56%.

Additional details and impacted files

@@            Coverage Diff             @@
##           v1.0.2     #154      +/-   ##
==========================================
+ Coverage   99.55%   99.56%   +0.01%     
==========================================
  Files          20       21       +1     
  Lines        2899     2980      +81     
==========================================
+ Hits         2886     2967      +81     
  Misses         13       13              

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