IncludeOS v0.12.0

Major features:
* NaCl,a configuration language for IncludeOS that you can use to add for example interfaces and firewall rules to your service. Add a nacl.txt file to your service with your configuration and this will be transpiled into C++ when the service is built.
* NAT & Firewall functionality
* VLAN (experimental)
* L4 Load balancer (experimental)
* New virtual memory implementation in C++, with W^X enforcement enabled by default.

Compatibility:
* Protobuf support (@RicoAntonioFelix)

Fixes:
* Routing
* Conntrack stability improvements
* Fixed an issue where a timer expiring in less than a microsecond would cause the timer system to stop and prevent future timers from being triggered.
* Several issues related to panic and backtrace to avoid repeated faults and get more consistent backtrace.
* Increased the size of interrupt handler stacks and moved them to high virtual memory with guard pages.

Other:
* Mender v1.0.x client moved upstream.

For full release notes see the github releases page.