Added completions for the 'Grouping' tag, using iTunes data.
Added the ability to String-Transform all of a file's metadata at once (context menu & edit menu)
Added the ability to batch-copy read-only attributes
Added the ability to batch-copy some attributes' “raw” value (offered when pressing the option-key)
New 'Edit in List / View in List (alternate)' entries in the tag context menus of the sidebar

There is no more lag when selecting a big amount of files. (Previously had to wait 40s when selecting ~500 files. Now selection is instantaneous even with a load of ~3000 Files on a classic Hard Disk Drive).
Column customisation menu: All visible columns are now initially part of the menu, for faster de-selection.