Added a Training Automaton and visible armor

I added the Training Automaton as a free, quickly recruited unit. Its 500 health and armor make it useful for checking how weapons behave against a durable target.

The unit has its own model, voice set and database preview, so it can be inspected and used through the same game systems as the rest of the roster.

“A recruitable practice unit provides a durable target for testing weapons and armor.”

I also added visible armor information and revised Valkyrie damage. This makes the relationship between weapon hits and protection easier to inspect.

The practice unit gives me a repeatable way to test new attacks, including the Shock and Fire Troopers introduced in the following update.