v0.19.0

v0.19

Minor simplifications and improvements in the nav:kepler solver.
Some part of the Navigation framework were incorrectly private, while they should be public, Health flags in particular.
L2P flag is now managed in Navigation Ephemeris.
More detailed documentation of the Navigation framework.
More CI/CD tests are introduced (now 217).

What's Changed

• NAV RINEX: improve documentation by @gwbres in #362

Full Changelog: v0.18.1...v0.19.0