refactor AI system

src/lib/ecs/system/ai/AttackEvaluator.h

@@ -0,0 +1,11 @@
+#pragma once
+
+class EntityAdmin;
+
+// Acquires/validates a combat target for ships with weapons. Scores high only
+// when the ship's health is not low and a valid target is within sensor range.
+class AttackEvaluator
+{
+public:
+    void evaluate(EntityAdmin& admin);
+};