refactor AI system

src/lib/ecs/component/BehaviorKind.h

@@ -0,0 +1,15 @@
+#pragma once
+
+// Identifies a ship behavior. Written into SelectedBehaviorComponent by the
+// AiSystem selection pass so each behavior's executor can tell whether it won.
+enum class BehaviorKind
+{
+    None,
+    Advance,
+    Rally,
+    Retreat,
+    Attack,
+    Repair,
+    SalvageScrap,
+    DeliverScrap
+};