Build processes for Mexico for import to US

[WesIngwersen]

We had existing code for this that worked for the template writer. This has not been updated to work for JSON-LD output. This would include flow name updates. I have moved the old code for this to a new branch

[m-jamieson]

This is partially complete - using ELCI_1, processes from Canada are created using a combination of Canada technology mixes (coal, gas, hydro, etc.) and applying those mixes against US-average profiles for those same technologies.
I'll rename the issue to reflect only Mexico.