More work on system page

lib/obp60task/TODO

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+- fix unstable accesspoint availability
+
+- page refresh after page change and not connected to key codes
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+- fix sd card code
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+- config: getFloat, getDouble
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+- dseg7 font to new version
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+- new pages: ais, autopilot, epropulsion
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+- automate config.json generation with extra_task.py
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+- extend boatdata: ais, waypoints, alarms
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+- page clock: sunrise / sunset in local time or UTC
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+- implement alerts