- Switch to cmake build system as upstream deprecates the
autotools one

- Update to version 1.0.0.1604610320.4639493f0:
* Stop the charade
* Stop using in-tree builds and use the ENABLE_WARNING setting instead of rolling our own custom flags.
* Move CI to ubuntu 20.04 and use the yaml-cpp package
* silence OpenGL deprecation warnings on MacOS 10.14+
* Final fix to 25y bug with throw
* Make shuffle deterministic
* Add missing Croatian characters
* Prevent AI frozen in place
* Fix build with clang 10.0.1 on FreeBSD
* Hack throw bug
* Mission zone fix
* Prevent psionic capture of uncapturable units
* Unified production monetary cost check
* Fix research lookup costs
* Set artifact site counters when loading OG saves
* fix small bug with melee reaction
* fix up some HWP damage values
* fix zombie armour values
* fix warnings about missing override keyword
* fix string conversion warnings
* treat third-party include files as system includes
* Allow player access to the built-in melee attack for Lobstermen
* Fixed average monthly rating calculation in StatisticsState