More Unit types needed

[ScorchedEarther]

For config-ing, it would be really useful to have some additional unit types. At the moment it is difficult to get Circuit to use some factories correctly, as while the Slasher and Rogue are both skirmishers, they have very different uses.

Ideally it would be good to have the following, which behave identically to and group with their parent type in game and are just different for purposes of Reactive building & production.

Raider2
Skirmisher2
Skirmisher3
Artillery2
Artillery3
AntiHeavy2
AntiAir2