Freeboard-SK v2.8.4

- Fixed: shore.basestation popover & properties not displayed.
- Fixed: Use performance data values to control layline display (#149).
- Updated: Display moored vessels with different image (#164).
- Updated: Color AIS vessels based on value of design.asiShipType (#162).

https://github.com/SignalK/freeboard-sk/releases/tag/2.8.4