Fixed broken darwin build (Velocidex#1043)

Prepare for release 0.5.8 (Velocidex#1014)

Prepare for release 0.5.8 RC1 (Velocidex#997)

Prepare for release 0.5.7 (Velocidex#973)

Added a System.Hunt.Creation artifact (Velocidex#911)

This allows for server monitoring artifacts that detect new hunt creations.

Also fixed possible deadlock in watch_monitoring()

Bugfix release 0.5.5-1 (Velocidex#895)

Prepare for 0.5.5 release. (Velocidex#878)

Fix crash on windows service. (Velocidex#841)

When a config file is missing, the service attempts to log but logging
is not yet available.

More UI cancellation on more widgets. (Velocidex#791)

Make it possible to use external SSL Certs. (Velocidex#742)

It is now possible to specify path to a .pem and .key file for regular
certificates, as issued using any number of CAs or even Let's
Encrypt's cert tool.

Frontend.tls_certificate_filename points at the full
chain (e.g. /etc/le/.../fullchain.pem) and
Frontend.tls_private_key_filename points at the private
key (e.g. ../privkey.pem).

* Added new winpmem artifact.