#1420 Add unit roles from Alpha Strike

[Pheonix Rising]

Doing so serves two purposes.
First, it can be used to allow greater flexability with the AI. Based on the units role you could have the AI determine how close or how far away it should be from its target. Would also make having the AI play double blind easier as scouting AI could be used to find the enemy rather than waiting for the AI to stop shuffling its feet waiting for a sensor return

Second, it would be a minor step on the road to adding hexmap Alpha Strike games as well AS lance building.