SignShop v5

I found it was necessary to update the API dependency to the 1.20 API so that I could access the methods for hanging signs. This means that this version of SignShop will only work with 1.20+ Therefore I am upping the major version to v4.
Version 4 not only adds the ability to use hanging signs for shops it also allows text on the back of shop signs.
There are 3 allowed text states on the back of a shop sign.

1. The back can be completely blank.
2. The back can match the shop on the front EXACTLY. This will allow the back to function like the front, even updating stock status.
3. The back can contain any text except for shop formatted text or text defined in a blacklist in the config.

Version 4 still supports dying shops with the addition of being able to wax them to prevent accidental re-dying. If you change your mind you can un-wax them using a brush.

Signshop will now retry the economy hook after the server is loaded if it failed the first time.