scanner: add sinaweibosdk, umeng and exoplayer cast extension

https://github.com/sinaweibosdk/weibo_android_sdk https://search.maven.org/artifact/io.github.sinaweibosdk/core/12.5.0/aar

There is no source.jar provided.

https://search.maven.org/artifact/com.umeng.umsdk/push/6.5.2/aar https://github.com/umeng/MultiFunctionAndroidDemo

The source code is a demo.

The cast extension pulls in GMS. https://github.com/google/ExoPlayer/blob/03569f9e6536e6c60cb585115d6d7352a4deab71/extensions/cast/build.gradle#L17