Performance & modernity changes

[randomblast]

Partially converted to ARC, for the bound UDP version. I'm not sure what the state is for the other classes - they might not even compile now.

The focus of these changes was on throughput & efficiency, but I also fixed some things which were causing pain in the application I was working on at the time. I actually don't remember the changes that well since I stopped using the library not too long after making them.