remove towers on player leave

include/server/game/ServerGame.h

@@ -35,6 +35,7 @@ public:
 	virtual void OnGameClose() override;
 
 	virtual void OnPlayerJoin(game::PlayerID id) override;
+	virtual void OnPlayerLeave(game::PlayerID id) override;
 private:
 	void BalanceTeams();
 	void InitPlayerStats();

include/td/game/World.h

@@ -219,7 +219,9 @@ public:
 
 	const TeamList& GetTeams() const;
 
+	TowerList& GetTowers() { return m_Towers; }
 	const TowerList& GetTowers() const { return m_Towers; }
+
 	TowerPtr GetTowerById(TowerID tower);
 
 	const Player* GetPlayerById(PlayerID id) const;