Borgs: no cell, no eyelights

Removes eyelights when a borg's powercell gets destroyed or removed. Light gets restored when powercell gets replaced. Also affects MoMMIs.

![k](https://cloud.githubusercontent.com/assets/6507460/5252957/06d5b890-79a3-11e4-8b1c-69aa4842e3f6.png)