Add coordinates for Frosthaven scenario stickers, overlay stickers

[michaelmcleodnz]

I'm just a random user who can't wait for Gloomhaven Storyline to support Frosthaven, so I thought I'd help by adding all the scenario stickers from Worldhaven and their coordinates. Some of the stickers could be improved because Worldhaven's images have magenta cut-lines over them, but at least the lines meant I could cut-out all the sticker shapes using imagemagick instead of manually.

I also included a simple implementation of the 4 'map overlay stickers', because they were needed to position the scenario stickers, and they don't need to be tracked anywhere except on the map.

I haven't attempted to add the building stickers, because I don't know how Gloomhaven Storyline plans to keep track of what buildings have been unlocked. But if the scenario stickers are useful, I could process the building stickers the same way and then let someone else decide how to use them.

[dducro]

Thanks for your contribution! I'll take a look at the changes, this will help a ton.

[michaelmcleodnz]

I cleaned up the images a bit because my first script left the edges a little jagged. (I blurred and sharpened the mask I was using)

[michaelmcleodnz]

Apparently Worldhaven actually uploaded new files without the die-cut lines since I last checked! So I went and updated all the files with magenta lines on them. I'm fairly confident that this is the best it can be now. (And it's slightly better than just copying directly from the 'individual stickers' in Worldhaven, because those have all been cut to the shape of the scenario picture instead of following the cut lines.)