New high-level, elegant, and efficient observer frame approach

[attipaci]

A new high-level, more elegant, and more efficient approach for coordinate calculations, using observer frames, which represent an observer location and time of observation. Upon configuring the frame, it precalculates the necessary quantities for transformations so they may be re-used repeatedly, with minimal added computational cost, e.g. to calculate the positions of many objects in that observing frame, as well as to allow converting between coordinate reference systems with ease.

[codecov]

Codecov Report

Attention: Patch coverage is 99.75460% with 2 lines in your changes missing coverage. Please review.

Project coverage is 99.02%. Comparing base (9e55aaf) to head (8888db0).

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #33      +/-   ##
==========================================
+ Coverage   98.70%   99.02%   +0.32%     
==========================================
  Files           3        6       +3     
  Lines        2004     2662     +658     
  Branches      378      499     +121     
==========================================
+ Hits         1978     2636     +658     
  Misses          9        9              
  Partials       17       17              

Flag	Coverage Δ
unittests	99.02% <99.75%> (+0.32%)	⬆️

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Files	Coverage Δ
src/refract.c	100.00% <100.00%> (ø)
src/timescale.c	100.00% <100.00%> (ø)
src/frames.c	99.74% <99.74%> (ø)
src/novas.c	98.62% <99.57%> (+0.12%)	⬆️

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