added isLocked() to lock the ground plane in hq
slight DRY
Merge pull request #2881 from ZappoMan/lockgroundplane

Lock the ground plane model in hq
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 pull request #2885 from birarda/remove-gnutls

remove dependency on GnuTLS for later replacement with OpenSSL