Core: New split path algo

[iopapamanoglou]

Core: New split path algo

Description

Current split paths are slow and don't 100% work.
This algo does some smart pruning.
It only looks at a single path in a split at a time.

Fixes # (issue)

Checklist

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[iopapamanoglou]

Superseded by atopile/atopile#523