cache of directory reading

[Sabio]

Moderator: Topic Split from here
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3. As I stated in the thread by Damian having a Library would make run time alot faster, instead of rereading everything on load every single time, there should just be a scan/rescan button or hotkey just in case there have been changes.

Disagree on that. I'd prefere to see Mp3tag as a tagging program not just yet another database.