WR4CV-10 back in service and much upgraded

Finally, WR4CV-10 is back in service and seems to be working well. Lots of changes and upgrades since the previous incarnation:

- Switched to Windows mini-PC and WDT software stack
- Switched to Masters Communications DRA-45 audio interfaces
- On VHF: AX.25, FX.25 (UZ7HO Soundmodem), VARA FM (NARROW)
- On UHF: VARA FM (WIDE)
- Backup battery good for about 24 hours

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