Qi

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This release focuses on fixing a blocking issue on the service directory proxy (mirroring) (45483).

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This release focuses on enabling remote access to service gateways on a machine hidden behind another,
by adding NAT support.

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This release focuses on improving security.
Particularly, libqi now requires `TLS 1.2` on server side.

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This release focuses on improving reliability of libqi client side.

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This release focuses on improving reliability and memory consumption.
It includes fixes to libqi.

Notice that this release introduces a small API breakage by changing `qi::Signal<T>` and `qi::Property<T>`
to be no more a `boost::function<T>`.
However `qi::SignalF<T>` still can be converted to `boost::function<T>` implicitely.

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This release focuses on improving security and fixes some gateway crashes.