don't look for GnuTLS from cmake
remove dependency on GnuTLS for later replacement with OpenSSL
remove GnuTLS include across repo
remove more gnutls includes
put back ssize_t definition
Merge remote-tracking branch 'upstream/master'
Made overlays thread safe for write operations, which solved a script
crash.
Merge branch 'master' of https://github.com/highfidelity/hifi
moved _sequenceNumber to OctreeSendThread
Merge remote-tracking branch 'upstream/master'
Merge remote-tracking branch 'upstream/master'
moved _sequenceNumber back to OctreeQueryNode

instead added incrementSequenceNumber() to OctreeQueryNode for
sendthread to use
Added some missing locks to make Overlays thread safe for reading as well.
Use local viewer model for specular.
Added a new lock specific to deleting, and improved safety
removed old code that was commented out

changed tabs to spaces
Merge pull request #2910 from wangyix/master

fix for skipped sequenceNumber bug in OctreeQueryNode
Merge pull request #2906 from Barnold1953/master

Write thread safety for Overlays QMaps
Merge pull request #2911 from ey6es/master

Use local viewer model for specular.
Merge branch 'master' of https://github.com/worklist/hifi into 19705