Refactor scene presence list for lockless iteration. Lock contention will now only be for simultaneous add/removes of scene presences from the scene.
Refactor scene presence list for lockless iteration. Lock contention will now only be for simultaneous add/removes of scene presences from the scene.

EriHoss/OpenSim_0.8.2.0_Dev_LibLSLCC,RavenB/opensim,TomDataworks/opensim,RavenB/opensim,RavenB/opensim,EriHoss/OpenSim_0.8.2.0_Dev_LibLSLCC,RavenB/opensim,EriHoss/OpenSim_0.8.2.0_Dev_LibLSLCC,EriHoss/OpenSim_0.8.2.0_Dev_LibLSLCC,TomDataworks/opensim,TomDataworks/opensim,RavenB/opensim,TomDataworks/opensim,EriHoss/OpenSim_0.8.2.0_Dev_LibLSLCC,TomDataworks/opensim,RavenB/opensim,RavenB/opensim,EriHoss/OpenSim_0.8.2.0_Dev_LibLSLCC,TomDataworks/opensim,TomDataworks/opensim,EriHoss/OpenSim_0.8.2.0_Dev_LibLSLCC