Revert emptyCell commit and remove global vars
Revert emptyCell commit and remove global vars

* The emptyCell commit (which has been deleted from history) caused a
  bug with round_end events where the winning team and winning reason
  were not written to csv output. Will need to revisit this.

* Removes most global variables as their scope can now be reduced.

Signed-off-by: Cullen Taylor <3dcbf3a94b3284553298f41295d5edcb98e95b59@outlook.com>

eggshell/demo_processing,eggshell/demo_processing