Cleaning up Nyx in prep for 2.0.0

[ChristopherRabotin]

Summary

Refer to #390

Architectural Changes

• Removed Python
• Remove TrajectoryData and a few IO Python-specific stuff
• Renamed Mnvr to Maneuver
• Maneuvers are now specified either by azimuth/elevation or by a vector in the desired frame (previously they were converted into an azimuth/elevation, but that could lead to NaNs)
• Spacecraft mass, SRP, and Drag now use the ANISE structure

New Features

No change

Improvements

No change

Bug Fixes

No change

Testing and validation

No additional important testing (aside from serde) because this is a cleanup

Documentation

This PR does not primarily deal with documentation changes.

[github-actions]

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[codecov]

Codecov Report

Attention: Patch coverage is 52.47525% with 336 lines in your changes missing coverage. Please review.

Project coverage is 67.81%. Comparing base (cc00ae3) to head (6eecf3a).
Report is 16 commits behind head on master.

Files with missing lines	Patch %	Lines
src/dynamics/guidance/mnvr.rs	13.82%	81 Missing ⚠️
src/od/msr/trackingdata/io_ccsds_tdm.rs	32.17%	78 Missing ⚠️
src/md/opti/raphson_finite_diff.rs	9.09%	50 Missing ⚠️
src/md/trajectory/sc_traj.rs	77.93%	32 Missing ⚠️
src/dynamics/drag.rs	0.00%	28 Missing ⚠️
src/md/opti/solution.rs	4.54%	21 Missing ⚠️
src/cosmic/spacecraft.rs	72.97%	20 Missing ⚠️
src/polyfit/polynomial.rs	91.66%	8 Missing ⚠️
src/od/msr/types.rs	0.00%	7 Missing ⚠️
src/od/msr/sensitivity.rs	0.00%	3 Missing ⚠️
... and 8 more

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #391      +/-   ##
==========================================
+ Coverage   66.92%   67.81%   +0.89%     
==========================================
  Files          89       86       -3     
  Lines       13679    13756      +77     
==========================================
+ Hits         9154     9329     +175     
+ Misses       4525     4427      -98     

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