Formspec revival

[SwissalpS]

This PR tries to bring back the inventory formspec allowing players to cherry-pick items. e.g. collector can't wrench bones because bones contain wrenched items.

Also I enjoy being able to peek into bones - curiosity.

[OgelGames]

I will look into this and #14 after merging #15

[SwissalpS]

haven't tested much yet and haven't included entities - there are certainly some things to clean up and optimize.

Edit: Something that may cause troubles is that the armor inv can now be used for anything, so there may be a problem when punched after having messed around with inventories.

I'm considering using a scrollable area for the inventories of bones - if that works at all. The formspec becomes huge now with split inventories.

[OgelGames]

I still think bones don't need the complexity of a formspec, just for the few times someone would need to look inside them, and the sneak-punch to pickup added in #14 already fixes the wrench problem (though it still checks the size of the metadata).

And one of the reasons I removed the formspec when I redid bones, besides the reduction in complexity, was to prevent players leaving bones in the world just because they didn't want some junk items.

[SwissalpS]

What about view-only formspec? That would also reduce the size as the player's inv wouldn't need to be shown.

[OgelGames]

That could work, you could even simplify it and use item images and tooltips to eliminate the need for detached inventories 🤔

[SwissalpS]

yep, and could skip empty solts to save even more screen estate.

[SwissalpS]

Something like c5eb604 - not as pretty as using list[...] especially the count. Needs to be right-aligned.
Using item_image_button[...] looks better than item_image[...], slightly.

[SwissalpS]

I'd prefer using list[...] for nodes (without modification permissions) and above version for entities.

[OgelGames]

For the reasons I mentioned above, I have decided against re-implementing formspecs.