Add FT8 DXpedition autorun band entries

[vsboost]

Many DXpeditions operate on alternate FT8 dial frequencies (Fox/Hound), e.g.:

80m: 3567

40m: 7064

30m: 10131

20m: 14090

17m: 18095

15m: 21091

12m: 24911

10m: 28091

It would be useful if these could be added as additional FT8 autorun entries (e.g. FT8-20m-DX) without replacing the standard FT8 frequencies.

This would allow Web-888 receivers feeding PSKReporter to monitor either standard or DXped frequencies depending on activity.

Proposed implementation:

Append new FT8 DXped entries to ft8_cfs[]

Append matching names to ft8_name[]

Do not modify existing indices

This preserves backward compatibility while enabling more flexible autorun configurations.

OR

Make FT8 autorun frequencies configurable in websdr.json

Thank you.

[vsboost]

I have submitted a PR for this.
#86