initial scrollto implementation:

use places/folder icon,
move link construction to JS,
only show icon on hover,
use 'searchresult' as css class name,
add filter/unfilter methods,
highlight searched files in current filelist
only filter when correct FileList is present
use correct doublequotes in template, remove container
make 'open in folder' action default for files
add fixme
Merge pull request #4263 from owncloud/search_scrollto

initial scrollto implementation