ItemsAdder support (for Blueprints)

[konfix]

Is your feature request related to a problem?

Hello, it would be awesome if BentoBox could support ItemsAdder custom blocks in blueprints.

This would allow users to create a blueprint that will also save all custom blocks and then load them while pasting. ItemsAdder has a documented API, and it looks like it wouldn't be too hard to implement to BentoBox's blueprints code.

From what I've been able to see, there is already a method of removing custom blocks from the island, so the only thing thing that needs to be done is actually saving the blocks and pasting them.

(I think custom blocks would be enough, there are also entities/liquids but I doubt anyone would need/want this on their islands)

The option should be toggleable somewhere in the config to prevent unnecessary performance loss, or added as a flag when saving blueprints (just like ignore air and water currently is)

It would be a very nice addition and surely that would help server owners to get more creative when creating islands :)

Example on how custom blocks can be implemented using the API:
IA-Edit - integrates IA custom blocks into FAWE (I know it's not related to blueprints but it could be useful)

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Agreements

• I have searched for and ensured there isn't already an open issue regarding this.
• I have ensured the feature I'm requesting isn't already in the latest supported BentoBox build or Addons.

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No response