add xcsoar / skylines thermal detector about opensoar HOT 8 OPEN

Basic detection is here I think:
https://github.com/XCSoar/XCSoar/blob/master/src/Computer/CirclingComputer.cpp#L112

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From what I know, it's a state-machine.

• From cruise to climb is via possible-climb. One must remain at least 15 seconds in that state, which means that during that time you circle with at least 4 Degrees per second.
• From climb to cruise is via possible-cruise. One must remain at least 10 seconds in that state, which means that during that time you must fly with less than 4 Degrees per second heading change.

from opensoar.

that would be quite simple :)
will check out the code

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there is also so smoothing going on at the turn rate it seems.

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Yeah, but that's not needed.

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why not? i have seen some quite serious spikes in these derivatives

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check

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