This PR adds camomile as a plugin-dep package (built by default) and the official example plugins.
Can be used as a testing ground to see how the Duo handles the Camomile based plugins.
I expect them to be very high on cpu usage at the moment, as Camomile code has a lot of non-realtime safe operations during processing threads.

Note that to build successfully, the host machine needs to be able to run ARM binaries (for the ttl generation).
Alternatively, we can manually copy the example plugins and so file, and let the Duo run the generator tool itself.

Testing welcome.