inital changes to add a version byte to packets
resolve conflicts on merge with upstream master
add packet version handling for DS packets
rename PACKET_HEADER to PACKET_TYPE, fix DS packet versioning
voxel-server packet version handling
packet version handling in audio-mixer
remove ping unknown thread, version for ping reply
packet versioning for HEAD_DATA packets
refactor packet version handling and apply to DS
apply refactoring changes to PACKET_TYPE_PING
use packet header byte methods in NodeList bulk processing
packet version handling in VoxelSystem parseData
use packet version helpers for PACKET_TYPE_INJECT_AUDIO
use packet version helpers in parseData methods
use packet version helpers for PACKET_TYPE_MIXED_AUDIO
use packet version helpers for PACKET_TYPE_MICROPHONE
use packet version helpers for PACKET_TYPE_SET_VOXEL commands
use packet version helpers for PACKET_TYPE_VOXEL_DATA
use packet version helpers for PACKET_TYPE_AVATAR_VOXEL_URL
use packet version helpers for PACKET_TYPE_TRANSMITTER_DATA