Introduce path cleaning

A new function sp is introduced. It does the same as ss but also cleans
the path.
Don't put plot over trailer z-index
remove only files, not folder

(or in worst case the download clients root folder and anything in it)
Merge pull request #2436 from jkaberg/develop

rTorrent: remove only files, not folder
Missing )
use delete_files
Cleanup import
Merge branch 'develop' of github.com:RuudBurger/CouchPotatoServer into develop
Added directory removal to the rtorrent downloader
Merge pull request #2438 from fuzeman/feature/dev_rtorrent

rTorrent: Delete Torrent Directories
replace multiple separators. fixes #2448
Allow 720p tag for screener
Escape filename before using it in a regex. fixes #2430
Added proxy support
Update __init__.py
Merge branch 'develop' of git://github.com/clinton-hall/CouchPotatoServer into clinton-hall-develop
Add some more double char replacements
Merge branch 'refs/heads/clinton-hall-develop' into develop
Fixed issue https://github.com/RuudBurger/CouchPotatoServer/issues/2440, by returning a 'True' status when an existing torrent in deluge is added from CP.
bithdtv provider

thanks to @lansinghd ,
https://github.com/RuudBurger/CouchPotatoServer/pull/2460