Working on factoring out the common metavoxel endpoint/client code.
Use the refactored endpoint/client classes in the actual client/server.
Merge branch 'master' of https://github.com/highfidelity/hifi into metavoxels
Merge branch 'master' of https://github.com/highfidelity/hifi into metavoxels
Modify tests to use Endpoint base class.
Fix for shared object reference tracking.
Increase the LOD threshold for now to get around spanner issue.
Merge branch 'master' of https://github.com/highfidelity/hifi into metavoxels
Fix Windows link error (hopefully).
Include an additional bit with the objects that says whether what follows is
a delta.  The clients may be retaining references to the objects, so we can't
rely on their having been deleted.
Merge branch 'master' of https://github.com/highfidelity/hifi into metavoxels
Merge branch 'master' of https://github.com/highfidelity/hifi into metavoxels
Merge pull request #3093 from ey6es/metavoxels

Factored out the common endpoint/metavoxel client code from the metavoxel client, server, and tests.