MAINT-6172: Send the render and mic devices to a session when they are dirty, not just in Tuning mode.

MAINT-6182: When building the list of pathfinding characters throw away any entries that are undefined.

MAINT-5693: Do not rerequest old bakes. If a stale bake is received for processing do not processes it (Only allow newer appearances to process... never older)

MAINT-5693: Request server bake even if we think we are about to request a stale version. The receiver should know if it will throw out the results. Added some additional logging to help track what's going on.

MAINT-5760 Save the favorite in file with empty slurl string if it points to location that is no longer valid

MAINT-5693: Some bake requests were getting lost. If a bake request is made while another one is outstanding rather than launch the new one, set a flag and remake the request with new data.

MAINT-6168 Crash in LLViewerParcelMgr::renderParcelCollision()

MAINT-6096: For non-spacial voice chats update the volume of participants. Rename "sendPositionalUpdate" to reflect volume changes.