[Course Import/Export] Add a "template_id" Field on the accounts.csv File

[wesley_dunnavan]

Adding a field to the accounts.csv file for a template course would be *very* helpful, particularly large school divisions that handle settings for all subaccounts (schools) centrally. I would like to be able to offer the course template feature to schools, and it would be much easier to be able to specify the unique identifier of a course template in a csv upload than to manually select a course template for all 64 of our schools.