Update Watermarks

[gaddlord]

Currently Watermark is on the Model level which is not accurate since every reprint might have/or not have watermarks.

1. Move WatermarkId to be in Cards table (not in Model table)
2. Update all watermarks from Scryfall
3. Check if we have all cards with Watermark
   https://scryfall.com/search?q=wm%3Aplaneswalker
   https://scryfall.com/search?q=wm%3AAzorius&unique=cards&as=checklist&order=name

Another option is that we drop support for Watermarks since it seems mostly visual and not worth filtering, searching, etc.
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