- fix unstable accesspoint availability

- page refresh after page change and not connected to key codes

- fix sd card code

- config: getFloat, getDouble

- dseg7 font to new version

- new pages: ais, autopilot, epropulsion

- automate config.json generation with extra_task.py

- extend boatdata: ais, waypoints, alarms

- page clock: sunrise / sunset in local time or UTC

- implement alerts

- page windplot: replace circles for degree symbol with font symbol

- central definition of placeholder symbol: ---