[Add]: Redownload when error

double click to redownload
[Ref]: Refactor search method
[Ref]: Refator downloadfile class
[Mod]: Remove all plugin update module
[Ref]: Refator GUI_download
[Ref]: Refactor WebRequestMethods
[Fix]: crash after press next_page button
[Add]: Get 'fenliu' address
[Add]: Try for baidupan password
[Mod]: Add some method, prepare for purse/restart
[Add]: GUI MenuItem for purse/start
[Add]: purse/start in downloading
[Fix]: can not get ehentai cover pic
[Fix]: Ehentai Force Download
[Fix]: field combo box can still edit while searching
Version 2.0.0.0
Merge remote-tracking branch 'origin/dev'