移动塔的时候碰到空塔位给一个虚影，没有资源暂时return

wangguan

2020-11-09 5d16d6e5172daf42d386baa5c09663b422f05a59

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namespace TowerDefense.Level
{
    /// <summary>
    /// An enum to represent the different level states
    /// </summary>
    public enum LevelState
    {
        Intro,
        Building,
        SpawningEnemies,
        AllEnemiesSpawned,
        Lose,
        Win
    }
}