Compose buildings from definitions and capabilities

tests/test_building_redraw_cost.gd

@@ -61,11 +61,11 @@ func _process(delta: float) -> bool:
 					continue
 				match b.building_type:
 					GameState.BUILDING_SHIP_CRAFTER:
-						crafter = b
+						crafter = b.visual
 					GameState.BUILDING_MOTHERSHIP:
-						mothership = b
+						mothership = b.visual
 					GameState.BUILDING_COMMAND_CENTER:
-						command = b
+						command = b.visual
 			if crafter == null or mothership == null or command == null:
 				print("TEST_BUILDING_REDRAW_COST: FAIL (buildings never spawned)")
 				quit(1)
@@ -88,7 +88,7 @@ func _process(delta: float) -> bool:
 			for b in [crafter, mothership, command]:
 				if b.draw_count != 1:
 					print("TEST_BUILDING_REDRAW_COST: FAIL (%s redrew its geometry %d times)" % [
-						b.building_type, b.draw_count
+						b.name, b.draw_count
 					])
 					quit(1)
 					return true