测试升级学员表（学员表增加一列）；增加im_lib（tcp连接）

endian11

2019-12-12 dce8fc9c184fb7fec64aaefa11a3be627a54093b

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<?xml version="1.0" encoding="utf-8"?>
<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
    <background android:drawable="@drawable/ic_launcher_background" />
    <foreground android:drawable="@drawable/ic_launcher_foreground" />
</adaptive-icon>