Revert "RSSyl: Just copy all of the custom folderlist xml tags in copy_private_data via folder_item_{get,set}_xml class functions, instead of handling feed properties one by one."

This reverts commit dc8728ee3222dbe49cdac81e6dc72b2ba206a046.
RSSyl: Copy RFolderItem private data properly.
RSSyl: Lose the .deleted file on folder move for now
fix `make dist`
you don't get into AUTHORS just for suggesting an idea, and that's all that the contribution is now
fix building with --disable-nls
updated translations

submitted by Yasen Pramatarov, Thomas Bellmann, Sian Mountbatten, Ricardo Mones Lastra,
Flammie Pirinen, "Genghis Khan", Mindaugas, Marcel Pol, Frederico Goncalves Guimaraes,
Slavko, and Andreas Rönnquist
RSSyl: when user chooses a different folder name for a newly subscribed feed, store the official title, so that it doesn't revert back after first feed update.
3.11.0 unleashed!
fix `make dist`