Make YarnProjectUtility.AddLineTagsToFilesInYarnProject public

[nrvllrgrs]

I would like to automate the process of adding Line IDs to a headless Unity. Meaning that I don't want to require the user to push the button, but instead have it automatically handled when a Yarn Script is submitted to version control.

I think the easiest solution would be to change YarnProjectUtility.AddLineTagsToFilesInYarnProject's permissions from internal to public.