c-ares / c-ares / #61

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Fix for TCP back to back queries (#552)

As per #266, TCP queries are basically broken. If we get a partial reply, things just don't work, but unlike UDP, TCP may get fragmented and we need to properly handle that.

I've started creating a basic parser/buffer framework for c-ares for memory safety reasons, but it also helps for things like this where we shouldn't be manually tracking positions and fetching only a couple of bytes at a time from a socket. This parser/buffer will be expanded and used more in the future.

This also resolves #206 by allowing NULL to be specified for some socket callbacks so they will auto-route to the built-in c-ares functions.

Fixes: #206, #266
Fix By: Brad House (@bradh352)

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