调整UI到BottomCanvas下，但是MainUI还需要保留，用来显示受击伤害文字

wangguan

2020-11-14 7f71e2c1cfb5a5bd329c87249c4da4f7f8cde330

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namespace ActionGameFramework.Projectiles
{
    public enum BallisticFireMode
    {
        UseLaunchSpeed,
        UseLaunchAngle
    }
}