FI-640: Improve performance of save_resource_references

[Jammjammjamm]

This branch incorporates the performance improvements that were implemented in the program edition.

Submitter:

• This pull request describes why these changes were made
• Code diff has been reviewed for extraneous/missing code
• n/a Tests are included and test edge cases
• Tests/code quality metrics have been run locally and pass

Reviewer 1:

Name:

• Code is maintainable and reusable, reuses existing code and infrastructure
  where appropriate, and accomplishes the task's purpose
• The tests appropriately test the new code, including edge cases
• You have tried to break the code

Reviewer 2:

Name:

• Code is maintainable and reusable, reuses existing code and infrastructure
  where appropriate, and accomplishes the task's purpose
• The tests appropriately test the new code, including edge cases
• You have tried to break the code

[radamson]

Code itself looks good and matches what is expected based on the previously reviewed PR for Program.

It might be worth rebasing and regenerating here to make sure that the generated code is up to date.

[yunwwang]

Code change looks good. There is a codeclimate/diff-coverage error.

[yunwwang]

Code looks good. Unit tests passed