"Recent" sorting

[jeofrey]

I vote for this functionality too.

For inspiration:
Kodi team has done best and very simple functionality of dateadded.
Look at http://kodi.wiki/view/Advancedsettings.xml

There are three options:
-- 0 results in using the current datetime when adding a video;
-- 1 (default) results in prefering to use the files mtime (if it's valid) and only using the file's ctime if the mtime isn't valid;
-- 2 results in using the newer datetime of the file's mtime and ctime -->