Use aggressive stance for similar troop counts.

Bumps the breakthrough requirement to 2x, elimination to 1.5x, and uses
agressive for 0.8-1.5x.

game/commander/tasks/primitive/aggressiveattack.py

@@ -0,0 +1,14 @@
+from __future__ import annotations
+
+from game.commander.tasks.frontlinestancetask import FrontLineStanceTask
+from gen.ground_forces.combat_stance import CombatStance
+
+
+class AggressiveAttack(FrontLineStanceTask):
+    @property
+    def stance(self) -> CombatStance:
+        return CombatStance.AGGRESSIVE
+
+    @property
+    def have_sufficient_front_line_advantage(self) -> bool:
+        return self.ground_force_balance >= 0.8