Change Log for 4.7.0

• Improve pose proxy

• Add facility for debug data recording

• improved status displays in GUI

• CombinerDifferentialImu defaults to ignoreGravity

• DTrack source defaults to oneBasedCounting

• Update NatNet SDK to 4.0.0

• guard against invalid UTF-8 issued by OptiTrack on non-English locales

• support LPMS sensors in VCP mode

• improve handling and avoidance of SteamVR room calibration

• improve startup in ignoreGravity mode (jump to optical pose in most cases)