✨ Only Delete / Write changed files when exporting #436

🛑 Before you Start

• I have searched existing feature requests for my feature.
• I have read the documentation, and I am sure this feature is not already implemented.
• I am using the latest version of Animated Java.
• I will only request a single feature in this request. If I have multiple feature requests, I will create a separate request for each one.

📝 Description

Deleting the whole resource pack and data pack, then re-writing them is inefficient.

We can fix this by only deleting / writing files if they're different from the current export.

💡 Describe the solution you'd like

Change the .ajmeta file's file lists to a map of file path -> hashed file contents to allow comparison to new files and avoid extra IO operations.

🧪 Describe alternatives you've considered

No response