FastShop - Unique shop system v1.3.6

1. Made it possible to change the name of shard currency.
2. Made it possible to change the placeholder of shard currency.

This gives the ability to use any shard plugin, and not only pikz Shard plugin.

1. Ensuring it execute the commands on the main thread.

1. Added an ADMIN Gui editor, not fully completed yet but much more easier than before.

2. You can now replace the item completely through GUI, take it modify it as you want, or just replace it with a new one.

You can now use a GUI to:
1. Change the price of the item.
2. Change the price of the sell item.
3. Change the max stack can be bought at once.
4. Change required space to purchase in case it has commands.
5. Change the inventory buying inventory title for each item.
6. Add or remove commands for each item.
7. Delete item button.
and much more...

7. Delete item button.
and much more...

1. Fixed the error on Folia.
2. Added a fall-safe to the license system in case it goes down, plugin works.

1. Made it so you can change the shard economy color.
2. Added permission to donutshop /sell

1. Fixed the problem were you couldn't get rid of default crates.

1. Added the item of adding / removing stack in config.yml.

1. Added a missing dependency.