Rogue Runner v0.5.1 - Taking Turns II

The turn system will now cope with player attacks.

I've also added the enemy moving into the system - but, for the moment, the player is controlling that movement.

Next:  I wanted to put off worrying about AI until later. But I'm going to make the enemy randomly choose moving or waiting for now so that I can complete the player-world loop.

Note: No new build for this update. I want to wait until I get the turn system finished first.