- Add more options for WebTools.kt

- Update VideoSource

- Update VideoSource

- Add subtitles to VideoItem

- Lib v2

- Change Paging flow to a simpler PagingData in HeadRepository
- Add convenient method to PagerData

- Lib v2

- Change Paging flow to a simpler PagingData in HeadRepository

- Change error callback to result pattern in SimpleOKHttp

- Add error callback to SimpleOKHttp

- Add more web tools: Unpacker, SimpleOKHttp

- Add ExternalVideoItem

Change implementation to jitpack