* These have been mostly replaced by the PriorityQueue sender in LLClientView (it was still using threads and poll processing!)
* Thread Reduction!
* Might have been sending more image packets then necessary previously, texture times 2. We'll see if this reduces the texture packet load.
This may break a lot of things, but it needs to go in. It was tested in standalone and the UCI grid, but it needs a lot more testing.
Known problems:
* HG asset transfers are borked for now
* missing texture is missing
* 3 unit tests commented out for now
