[2/2] Unlinked volumes & expandable volume overlay

* Add option to unlink volumes.
* Add user configurable options for volume overlay.
    Choose from single, expandable, expanded and hidden.

[2/2] 分离音量 & 可展开音量调节面板

* 添加允许独立调整各项音量的选项.
* 添加用户可配置的音量调节弹出框.
    可在"单行", "可展开", "已展开", "隐藏"中选择.

[1/2] in platform_frameworks_base
[2/2] More functional volume rocker

* Add option to wake screen with volume rocker.
* Add option to seek music track with volume rocker longpress.
* Add user configurable option to
    control cursor in text field with volume rocker.

[2/2] 功能更丰富的音量键

* 添加可用音量键唤醒屏幕的选项.
* 添加可用音量键调整播放曲目的选项.
* 添加用户可配置的输入框中音量键调整光标的选项.

[1/2] in platform_frameworks_base
[3/3] Add AOSP Dialer check

* Adds a check for the AOSP dialer so features depend on it
    will be disabled in Google dialer is used.
* Disable increasing ringtone option if Google dialer is used

[3/3] 添加AOSP电话的检测

* 添加对AOSP电话的检测, 从而
    在用户使用Google电话时禁用不支持的特性.
* 当检测到用户使用的Google电话时,
    禁用渐强音量的选项.

[1/3] in platform_packages_services_Telephony
[2/3] in platform_frameworks_base