Add tests to BOD and fix parsing

[clemarescx]

This PR adds 5 tests for parsing BOD, using the two examples from gpsd's BOD - Bearing - Waypoint to Waypoint. The checksums were not correct so they were recalculated.

The tests cover sentences with active route, and without (described as GOTO mode in the reference page):

• active route format
  • both waypoints
  • missing destination waypoint field
  • missing origin waypoint field
• GOTO mode
• missing bearing field

The current implementation only worked for the active route format (i.e both waypoints are present), so I fixed the implementation to pass all tests.

[elpiel]

Thank you for fixing this and adding more tests! 🥳

And congratulations on your first contribution.

[codecov]

Codecov Report

Base: 76.27% // Head: 78.64% // Increases project coverage by +2.36% 🎉

Coverage data is based on head (acceca0) compared to base (500175e).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #61      +/-   ##
==========================================
+ Coverage   76.27%   78.64%   +2.36%     
==========================================
  Files          21       21              
  Lines         801      796       -5     
==========================================
+ Hits          611      626      +15     
+ Misses        190      170      -20     

Impacted Files	Coverage Δ
src/sentences/bod.rs	86.66% <100.00%> (+86.66%)	⬆️
src/sentences/utils.rs	100.00% <0.00%> (+6.89%)	⬆️

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