Less crashes, memory leaks and new configuration options!

So many fixes! You can now set the default modes for new channels, use HAProxy again, use the umode +R to protect yourself against unwanted PMs, and we now warn on configurations/setups that look incorrect!

In addition, this release makes testing easier, makes sure we better adhere to the SASL specification and also removes some memory leaks around the place. All in all, just a solid upgrade and less bugs across the board.

Thanks to @slingamn and @euank for the awesome help with this release!