Make more parts of the loader iterative

Daniel Silverstonerequested to merge
danielsilverstone-ct/iterative-loader-bits into master

Description

Again, aiming toward a point where we can Cythonize more of the loader, make more of it iterative.

Changes proposed in this merge request:

  • loader.py: Make _sort_dependencies() a static iterative method
  • loader.py: Make _collect_element() iterative

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