possible fix to particle server crashes
Revert "possible fix to particle server crashes"

This reverts commit cae9bc7a0f97a2496f1bbcd6381cc4ed00fb4ecf.
Merge branch 'master' of https://github.com/worklist/hifi
Merge branch 'master' of https://github.com/worklist/hifi
Merge branch 'master' of https://github.com/worklist/hifi
Merge branch 'master' of https://github.com/worklist/hifi
add an AvatarManager that will keep Avatars in Application thread
have avatar-mixer report avatar kills to all avatars
complete migration of Avatar list to AvatarManager
resolve conflicts on merge with upstream/master
fix rendering of Avatars
allow recursive locking on the NodeHashMutex
add a missing break, don't double activate sockets
NodeData cleanup thanks to separation from rendered avatars
handle merge with nodelist-patches branch
repair calls to broadcast to nodes
broadcast node kills to agent, not avatar-mixer
cleanup debug and Avatar destructor
remove notion of owning node from NodeData
put back the important Avatar destructor