v1.5.0

Full Changelog: v1.4.0...v1.5.0

Notes

• add transmitter characteristics: polarization and harmonics
• add modular tutorial for the transmitter characteristics
• combine Doppler effects and transmitter characteristics effects
• update arrow file creation script to accept multiple satellites, e.g., Starlink + JPSS
• optimize the script for creating satellites' arrow data file
• fix flake8 issues
• update docs