Update games.yaml

Added **Xenowar** as a XCOM reimplementation alongside UfoAI.

(development halted, playable, C++) -> Google Code Repo
Update games.yaml

1. Added Xenowar as a XCOM reimplementation alongside UfoAI.
2. Changed repo to url and put https://code.google.com/p/unflobtactical/source/browse/trunk as repo
Merge pull request #98 from nzero/patch-1

Update games.yaml