airMAX AC 8.7.13

Improvements
- Regulatory: updated E-label for PS-5AC.

- System: Reduced device memory consumption when using UISP.

- Wireless: Show signal level when the station is only partially connected.

- Wireless: Keep remote statistics for a longer period of time.

Bugfixes
- Web UI: Fixed Armenia country label.

- System: Fixed management radio timeout while using UISP mobile app.

- Wireless: Fixed station crashing when not connected to AP for a long period.