While centroid is a more accurate term, coords is a little simpler when
writing it a million times.
Prefer to use a single term (sphere was using coords) to simplify API.
- new intersection points are generated per vertical coord present in the original polygon rather than per vertex and are grouped together rather than associated directly with the parent
- hopefully better code structure and organisation for the entire triangle generating section
Reduce number of times the inside table needs to be indexed or have length checked.
Also assign debug zones to table without having to be inside the zone.
lib.zones.new should take a single argument containing all
data related to the new zone, then append new fields to the table.
No need for a distance check and 'nearby', instead check if player
is inside the polygon.
Use a function ref instead of closures for debug (drawPolygon).
