Add clear "dual-frequency support" label

[barbeau]

Summary:

I'd like to add a new card to the Status view that gives a few easy-to-read labels for whether dual-frequency is supported on the device - something like:

"Dual-frequency: (Not supported) (Supported) (In use)"

...and the one that's highlighted would clearly indicate the level of support that the device has for dual-frequency GNSS.

I find myself explaining how to tell if a device supports dual-frequency a lot, and this would simplify things.

Steps to reproduce:

Look at Status view

Expected behavior:

Give me a clear indicator in Status whether dual-frequency GNSS is supported on a device

Observed behavior:

I have to look at the CF column, figure out if any L5 signals are in view, and then figure out if any of the satellites that have the same ID have more than one record with a U flag (for determining "in use").

Device and Android version:

N/A

[barbeau]

I've started working on logic that can support this at #355.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[barbeau]

Closing this as a duplicate as it will be part of #313