More rename gps to gnss

[rzinke]

Description of proposed changes

Reminders

• Fix #xxxx
• Pass Pre-commit check (green)
• Pass Codacy code review (green)
• Pass Circle CI test (green)
• Make sure that your code follows our style. Use the other functions/files as a basis.
• If modifying functionality, describe changes to function behavior and arguments in a comment below the function declaration.
• If adding new functionality, add a detailed description to the documentation and/or an example.

[yunjunz]

HI @rzinke, these new names already exists; and as we discussed before, we want to keep this old names as well for backward compatiability.

[rzinke]

Thanks for the reminder. I had forgotten or misunderstood that we wanted to keep the old variable names (gps_ ) for backward compatibility. Closing this request now.