Extract geo methods into hypership/geo library
The code for cartesian/spherical/cylindrical coordinates has been
extracted and moved to a new library, hypership/geo.
This change removes the library code for the Zed codebase
and supersedes it by calls to the library classes.
A Smarty modified plugin 'sector' avoids direct call to Octocube
class into a template.
The legacy GeoOctocube class contains a method specific to Zed
to generate a MySQL search clause for a sector and a specific height.
This has been moved to a new OctocubeBuilder engine.
Test Plan: Unit tests provided for new plugin.
Reviewed By: dereckson
Differential Revision: https://code.zed.dereckson.be/D16