[BUG] (Experimental Branch) Exporting a rig replaces the current block atlas instead of merging

[InQuognito]

Describe the bug
Any custom directories indexed in the block atlas get replaced by Animated Java.

To Reproduce

1. Create a block atlas in minecraft/atlases/blocks.json and fill it with data
2. Open a blueprint and export.
3. Check on the block atlas.

Expected behavior
The block atlas should be merged in order to preserve any current resource pack texture definitions.

Screenshots

Desktop

• OS: Windows 11
• Version next branch build as of 12/22/2024 10:00AM