A first version of an editor focused exclusively on the easy editing of Cubes, Columns, and Slabs. Currently, it modifies the original files, which must be placed in their own data folder. At the moment, you can edit the parameters of cubes and columns; at the time of publishing this, I realized that the slab columns are not yet editable! But this will be added soon. The advantage is that, in addition to slabs, it loads complete IDs, grouped into solid, water, and lava, and you can modify the textures directly from that state. It also includes a simple tile animation editor, located at the end of the animation tiles, accessible by pressing a + button, quite hidden because it will not be used much.
Upcoming changes:
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Editing slab parameters (first)
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Loading and saving custom map files.
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Adding new IDs for all elements to their corresponding files.
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Dragging cubes or columns directly onto slabs and assembling them organically, like Lego bricks.
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Checking for duplicates. This will help determine if a duplicate is being created and, if so, discard it and use the one with a lower ID.
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Compatibility to read and modify the Unearth custom_slabs.cfg file, to easily add edits to the editor.
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Adding objects and effects to slabs. (Currently, this can be done in Unearth, so it has lower priority).

Splendid!