Stage B of the ridden-roads work. GPS.detectWalk() flags contiguous low-speed
runs (< walkDetectKmh, or the single-speed 30-rpm push speed, for >= walkMinRunSec)
as walking inside a bike/other ride. Persisted per point (gps_points.walk, via
DB.setWalkFlags in recalculateSession + recomputeAllStats). rebuild_roads maps a
walk point to atype 'walk' so it colours as walking and is not treated as a
rideable road. Track detail colours walk runs and shows 'пешком: N мин / X км'.
Verified detectWalk on real tracks: 98% on a mostly-pushed 4km ride vs 1% on a
normal 16km ride.
4aiman
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