[2/2] Alternative screen-off animations

Add alternative screen-off animations.
Now users are allowed to choose from the following options:
* Fade out
* Electron beam[CRT screen-off] (default)
* Scale down

[2/2] 备用关屏动画

添加备用关屏动画.
现在用户可在下列选项中选取:
* 淡出
* 电子光束[CRT显示器关屏] (默认)
* 收缩

[1/2] in platform_frameworks_base
Option to reset user preferences

Add an option in "Settings/Backup & reset" for users to reset
their user interface preferences.
For now, they are allowed to reset Pie enable/disable state.

重置用户偏好选项

在"设置/备份和重置"中添加一个可让用户重置他们的用户界面偏好的选项.
目前, 他们可以重置Pie的启用/禁用状态.