disallow Agent copying
disallow copying of AvatarData objects
disallow copying of Avatar objects
inline getters and setters in AvatarData
inline getters and setters in Avatar
disallow copying for AudioRingBuffer objects
disallow copying of VoxelAgentData objects
fix eve's use of the now disallowed copy constructor
disallow copying of VoxelSystem objects
Merge pull request #339 from birarda/no-copy

remove ability to copy AgentData and subclasses