[2/2] LED customization

* Add LED customization.
* Add global and per-app settings.
* Set default LED color as white.
* Remove stock on/off checkbox and add an dedicated category.
* Comment out dead code from display settings.

[2/2] 个性化LED

* 添加LED个性化.
* 添加全局和各个应用的设置.
* 设置默认LED颜色为白色.
* 删除原生开/关勾选框, 并添加一个独立分类.
* 将显示设置中的无用代码加为评论.

[1/2] in platform_frameworks_base

Thanks to CyanogenMod for the original implementation.
感谢CyanogenMod原创实现此功能.
[2/2] User configurable safe headset volume

* Add an user configurable option to
    enable/disable safe headset volume.
* Add restore volumes after boot and when a headset is plugged.

[2/2] 用户可配置的安全耳机音量

* 添加一个用户可配置的选项
    来启用/禁用安全耳机音量.
* 添加耳机插入时, 设备启动后恢复音量.

[1/2] in platform_frameworks_base

Thanks to CyanogenMod for the original implementation.
感谢CyanogenMod原创实现此功能.
Add zh-rCN translation by @silverhoo1124

添加来自 @silverhoo1124 的简体中文翻译
[2/2] User configurable (un)plug wake/nofitication

Add an user configurable option to enable/disable
* Wake the display when charger power is connected/disconnected.
* Play notification sound when charger power is connected/disconnected.
* Vibrate when charger power is connected/disconnected

[2/2] 用户可配置的(断开)连接唤醒/通知

添加一个用户可配置的选项来启用/禁用
* 充电电源连接/断开时唤醒屏幕.
* 充电电源连接/断开时播放通知声.
* 充电电源连接/断开时震动.

[1/2] in platform_frameworks_base

Thanks to CyanogenMod for the original implementation.
感谢CyanogenMod原创实现此功能.
Recent panel scale mode & lefty mode

* Add scale mode:
    Allow user to scale recent panel size down.
* Add lefty mode:
    Allow recent panel to show up on the left edge
    instead of the right edge for left handed people.

最近应用面板 缩放模式&左利手模式

* 添加缩放模式:
    允许用户缩小最近应用面板尺寸.
* 添加左利手模式:
    允许最近应用面板从左侧出现(而不是从右侧),
    方便左利手用户操作.

Thanks to SlimRoms for the original implementation.
感谢SlimRoms原创实现此功能.