Display "--" for ping values if not yet valid
Use valid font for Windows so that '-'s are displayed
Merge pull request #3865 from ctrlaltdavid/20197

CR for Job #20197 - Bug: Initial ping stats mis-reported
Merge branch 'master' of https://github.com/highfidelity/hifi into metavoxels
Rejiggering the heightfield renderer for LOD.