prepare to refactor download module
add download db

go on tomorrow
Add download provider,manager,info.

Update DB,Task,Entry.
Modified settings summary
Modified Download Db,Manager,provider

test proivder passed.
Modified Download Task,Manager,job,info,db service
Optimize Download DB,Job,Manager,provider,and task
大体实现下载功能（未完，待续）
Update Download Manager Activity

add DownloadJobAdapter
and so on.
Download mananger Activity的完善
MainActivity的action
Revert PlayActivity.

Optimized ApiParser and fileUtil
继续完善Download模块

基本实现暂停、继续、以及进度条的刷新
修正下载进度的接收。完善删除
修复暂停后继续下载崩溃的问题。下载模块基本完成
修正链接的正则匹配