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Made some changes to how data is handled in transit and implemented a new feature to suppot a new flow: creating a target from a mixture.

Let's say you have a mixture that's working perfectly for you. Or you've read online about the perfect formula for this or that but it's all things you don't have on hand. Now you can recreate their mixture and make a target from that. Then you can make a mixture with the items you do have available and use the optimizer to find a close approximation. The new guide, Recreating a Mixture with Different Substances, walks you through this exact scenario.
New Features
- Added create Nutrient Target from Mixture
Bug fixes
- Improved data loading logic
- Fixed issue with copying Targets