Bug#806989: game-data-packager: add support for "Caesar III" playable with CaesarIA engine

[Vincent Pelletier]

I cannot seem to find a repository of the caesaria engine which has
activity more recent than 2016.

On the other hand, I found a pair of active projects which implement
the caesar3 engine and thought I should update this bug report. Those
two projects are related to one another (augustus is a fork of
julius):
- https://github.com/bvschaik/julius focussing on bug-for-bug compatibility
- https://github.com/Keriew/augustus which makes a lot more changes to
the gameplay

Neither seem packaged in debian, and the "augustus" name is taken.
-- 
Vincent Pelletier