Feature request: show the name of the file being annotated

[JoyfulGen]

It would be useful if the Mothra annotator showed the name of the json file being annotated. It's surprisingly easy to forget which file I'm on when I'm doing several in a row! I think the name could go above the Annotations column; the "Annotations" title could go a bit lower to make space for the file name.

[giannatan]

Would it also make sense to have the file name inside the bottom bar (next to the X and Y coordinates and whatnot)? I feel like the right panel is already fairly crowded with information.

[JoyfulGen]

Yes, that's a good idea, thank you!