v3.0

New features

• New low-cost solver which generates solutions with low (but not quite minimal) cost.
• New --optimize option to generate multiple solutions for each puzzle and pick the best ones.
• New --analyze option to generate a summary of each puzzle, including reagents, products and required reactions.
• Readme now includes a detailed design overview.

Improvements

• Many small optimizations to the old ("standard") solver.
• Now uses lp_solve to generate a more sensible recipe for each solution, avoiding waste where possible.
• Now verifies multiple solutions in parallel to save time (controlled via --maxparallelverifiers).
• Optional wrapper script (run.ps1) to both generate and verify solutions in parallel.

Internal changes

• Now targets .NET 8.0
• Extensive refactoring and other changes