Paid Scenes Have sex with cheerleader in the train

Fixes:
1. During the introductory animation, the PingZi's speech sometimes suddenly cuts off.
2. During the introductory animation, Mr.Liao's have one incorrect hand movement.
Additions:
1. "BackSpace" to switch between "free/fly" views.
2. Choose whether hold or drop the pum-pum at the end of introductory animation. You won't have this choice if you selected "skip the dialogue" at the beginning of the scene.
3. Improved some hand animations, because the pum-pum is gone.

修正：
1.引导动画中，有时瓶子说话会突然中断。
2.引导动画中，阿嘹的一个错误手部扭曲动作。
增加：
1.按下回退键切换”自由/飞行视角"。
2.结束对话时选择是否丢掉毛球。如果在场景一开始就选择“跳过对话”将不会出现这个选项。
3.完善了一些手部动画。