MainCanvas为Space，调整新手引导在Bottom上，还原魏哥UI适配代码，改为延迟执行

wangguan

2020-11-05 ac76c8913e3497e8789411105e541cb6afa189b2

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