Rename on-future to prepare-environment-fedora.sh
Separate file name and uri for MediaFiles.

Construct MediaFiles from std::string instead of Glib::ustring.
Construct MediaFiles from uri.
Use file uri for playing media file.
Use file uri for getting tags.
Catch std::out_of_range for out of end iterators.
Change format of date from DirectoryObservers.
Fix test for checking info from iterator.

It has hardcoded value of date about changing of directory.
In future it must be replaced on something better as assert.