Draft: folderload: Add new plugin
Add a new plugin, folderload to add other media to playlist from the containing directory of the playing video.
Based on https://bugzilla.gnome.org/attachment.cgi?id=124660&action=edit
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Menu item enabled when opened local files that adds other files in the same directory to current playlist -
Disable menu item when more then one item is in the playlist -
Don't duplicate current file and preserve its position in the playlist
Fixes #439 (closed)