[new port]: games/colobot: educational real-time strategy video game featuring 3D graphics

The objective of the game is to find a planet for colonization by the human race
by establishing a basic infrastructure on the surface and eliminating any alien
life forms endangering the expedition

You can program your units (bots) in a language called CBOT, which is
similar to C++ and Java.

Reviewed by: tcberner
Differential Revision: https://reviews.freebsd.org/D19481