only send PACKET_TYPE_VOXEL_QUERY to voxel servers in view
only send PACKET_TYPE_VOXEL_QUERY to voxel servers in view
Merge pull request #1120 from ZappoMan/rate_control

Only send PACKET_TYPE_VOXEL_QUERY messages to voxel servers that are in view.
Merge branch 'master' of https://github.com/worklist/hifi