feature request mkvnote: display all tags, regardless of profile

[BleakleyMcD]

Seeing all the tags in a file, regardless of profile chosen, would be great. This could be in a simple .txt file that pops up. I don't think swiftD is limited to three buttons, which is a bummer, so if there is one for "tag on" "cancel" and "file style" that doesn't leave one for "show all tags"... but it feels pretty crucial to see all tags before/while embedding new ones.

Maybe the .txt with current tags pops up automatically, probably behind the swiftD window, and the user it informed of its presence and needs to find it if they want to see the tags?

@dericed