Major improvements to Voxel Packet "packing" and compression

- Improves how Voxel Packets are "packed" resulting in about 30% better utilization of 1500 byte packets
- Fixed a bug that caused us to include subtrees for LOD cut voxels that were determined to have their colors sent (another 20%-30% savings)
- Implements support for "Compressed Voxel Packets" - sometimes saves 15%-60% depending on content
- got rid of a whole bunch of old menu items and settings we don't need anymore.