Added a field medic and scavenged weapons

The Field Medic is a barracks unit with a heal beam and both hands free. It closes on wounded infantry instead of standing in a firing line.

Dropped gear is now a real object on the sand. Clicking it sends a soldier to pick it up, and a scavenged rifle equips into an open hand. The medic in the capture is holding a recovered service rifle.

“A dropped rifle should be a decision, not a disappearing icon.”

Turrets gained half again their old range. Remote Command can be placed on explored ground, and the hero slowly recovers health without a medic nearby.

Double-tapping a control group recenters the camera on that group, which matters more now that the desert is large enough to lose a squad in.