Peter M. Groen / FlashMQ

We interpret the close frames as closed transport, and therefore set
'error' to 'disconnected'. See code comments.

Files are simple serialized bytes prefaced by lengths. File is hashed to
verify integrity. This was also a good way preventing unexpected errors
when trying to crash the parser by having it load a different file.

This change includes some refactoring that was necessary:

- It 'fixes' looking at the wrong thread's authentiction. This is still
  wrong though. It will be fixed by a thread local pointer in the next
  commit.
- Deadlocks with yourself are handled in rwlockguard.
- QoSPacketQueue is now a class.
- Probably other tweaks.

This fixes side effects when system time changes.

https://github.com/halfgaar/FlashMQ/issues/2

Encrypted version only.

Profiling showed it was significant enough to do so.

This also adds configuration options for choosing what address to bind
to.

This allows creation of multiple listeners, with different protocols
and/or SSL certificates.

Related change: settings is now a class that is copyable and assignable,
and is done so to each thread on reload.

Semi-related fix: fix crash in quit when multiple threads initiated it.
This came to light when testing the auth plugin settings.

The ping/pong is actually untested at this point, because Paho (my test
client for now) doesn't do those. I wonder if any do, because MQTT
already has ping/pong.

And some side issues.

And include some extra error conditions.

This includes a timer mechanism.

It can be defined in the config file, along with options.

It's a little faster.