first cut at added voxel node memory usage debugging to client and server
added more stats to voxel server status
move loading of voxel file to the persist thread so that assignment client will load voxel server faster
added additional debugging of VoxelNode memory usage, shrunk size of VoxelNode by better alignment
Merge pull request #1059 from ZappoMan/voxel_memory_stats

Voxel memory stats/Load voxels on persist thread/Save memory with VoxelNode size savings