nix Waypoint::ap_coloc

[yakra]

ap_coloc isn't needed for every waypoint, only graph points.
It could conceivably be nixed, and stored in a std:pair with the corresponding waypoint in hi_priority_points & low_priority_points for graph generation.

Syntax might be a drag though, short of switching to C++17 & using structured bindings.

• Do hi_priority_points & low_priority_points go out of scope, or hang around? When can these vectors be deleted or at least cleared?

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sizeof would still be 104 on FreeBSD & 112 on Ubuntu. Still above the magic 96 B for fitting 2 objects in 3 cache lines.
88 B on CentOs though.