Move PositionOctreeTest into TychaiaTool.

Summary: This moves the PositionOctreeTest into TychaiaTool and removes the old project.

Test Plan: Run `TychaiaTool.exe test-position-octree`.  It should outputs some numbers.

Reviewers: Sabre070

Reviewed By: Sabre070

Maniphest Tasks: T101

Differential Revision: http://code.redpointsoftware.com.au/D68