Gnss-lib-py

- Vectorizes SP3 and CLK parsing for faster SV state computation
- Fixes bug in tutorials where `add_sv_states_rinex` was not being called
- Bug fixes in `ephemeris_downloader.py`
- Updates dependencies to latest (as of release)

Major overhaul of ephemeris capabilities
- adds `ephemeris_downloader.py` that can automatically download `rinex`, `sp3`, and `clk` files.
- adds `gnss_models.py`
- adds `sv_models.py`
- breaks out `clk` and `sp3` functionality into separate parsers

- Added a parser, tests, documentation, and tutorial for Rinex 3 .o files
- Resolved an issue in `navdata.where` in which running `where` on a single column `navdata` would return empty, even when the condition was fulfilled by the already existing column
- small updates to documentation

- Automatic generation links for methods, class definitions, and functions to their GitHub files from the documentation
- Accounts for rotation of Earth in WLS navigation solutions.
- Adds tests to check that WLS estimates are closer to Android baselines when the rotation of the Earth has been accounted for.
- Updates tutorials, docs, and tests to reflect new functionality

- Adds functionality to parse NMEA files with GGA and RMC statements
- fixes https://github.com/Stanford-NavLab/gnss_lib_py/issues/111 , adds pathlib compatibility for file inputs
- updates python package dependencies

- fixes 104
- adds smartLoc tutorial, references on main page
- fixes 106
- adds multi-trace plotly map tutorial