add zoom and pan
mip-mapping on z0 tile -- getting a seam though, so might need to do it manually (ugh)
indentation
misc
experimental zoom fallback
misc
fix bug with wrong tiles showing up during sudden movements
fix the rogue tiles bug!
set tile census ref point to max edge of screen (allows deep zooms away from pole)
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poc for double precision approximation!!!
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such constants
fix bug of deep tiles not loading when crossing IDL
shader code as js template
templatized shader
dynamically control extent of flat-earth approximation
support flat earth approximation on anti-pole
consolidate how pole caps are colored
polar edge cases