MAINT-5831: If there is a teleport request active and it has failed, teleport state will always return "None".

MAINT-5804, MAINT-5890: Incorrectly trapping timeout in event poll and canceling coroutine before it's finished.

MAINT-5831: Discard late teleport initiation for teleport sequence that has already failed.

MAINT-5820: Add a success/failure result to HTTP body parse method and react to that rather than an "undefined" LLSD

MAINT-5812: Correctly pull a string from the raw body.  Only compare languages if detected_language is blank.

MAINT-5791: Change the way the TOS dialog is retrieved after the site-alive test coro.  Use handles rather than findTypedInstance.

MAINT-5780: Be sure that the LLViewerMediaImpl instance does not get deleted while the MIME discovery coroutine is executing.  If the refcount on the instance is 1 perform no processing.

MAINT-5732: Behavior #2.  Be sure that the internet stream is stopped before destroying the streaming audio interface. Otherwise FMODEX blocks on close.

MAINT-5271: Converted internal pointers to internal operation to managed shared pointers. Removed direct cast and dereference of handles.

Refactor any remaining LLCore::HTTPHandlers to use boost::shared_ptr
Started minor refactor in the materials manager into coroutines (unfinished)

SL-230: Azumarill viewer was incorrectly swallowing upload errors returned from the server.  Correctly report errors and use upload cost provided by server.

MAINT-5691: Browser was using deprecated outbox display type AND not correctly returning error body to application.
LLCore:HTTP now will provide and LLSD translation of the message body when possible in the case of an error HTTP result
VMM alert boxes now use type="alertmodal" rather than "outbox"

MAINT-5693: Consolidated the avatar appearance request into a coroutine.  If the request fails because of a stale COF, then rerequest with the corrected one.