Updates to embedded art are ignored by MM8

[ShadowXhawk]

I noticed that when I change the embedded art for an mp3 file already scanned and added to MM8's library, the change will never show up even if I rescan the folder with MM8 or exit and restart the App.

Basically any changes to the embedded art are ignored by MM8 until I uninstall and reinstall the app to scan files with a fresh start.

I think having MM8 update changes to embedded art is critical, but also useful would be the options to allow 'continuous scan of folders' and 'scan at startup' for users to control when the scan takes place. Just my 2 cents.