Remove trailing whitespaces on save

[raress96]

Hello.I would like to suggest a feature for this plugin.
It would be nice if there was a setting to specify if we want trailing whitespaces removed from all lines when we save.This will be such an awesome feature and the default Eclipse PDT allows you to do this for PHP files already.
Also, it would be nice to have CSS autocomplete inside twig files like in Netbeans.