* Removes polling stuff (call to gMeshRepo.update()) which did
nothing but check if uploads already finished.
* Just creates and runs the state machine (AIMeshUpload) instead
of creating an LLThread derived class (LLMeshUploadThread) and
adding that to a queue, then have the main thread start it
after adding it to another queue in order to keep track of
the instances (both queues are gone).
* mWholeModelUploadURL was moved to the state machine, because
it needs a life time till the responders finishes (can't be
part of the thread object).
* LLMeshUploadThread is now derived from AIThreadImpl instead
of LLThread, so it can be run in a state machine thread.
* The call to LLHTTPClient::post is now done from the main
thread instead of from the thread, but I don't think that is
a problem.
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