Make it easier to apply changes to files with merge conflicts or DME changes

[j-mie]

https://github.com/{DOWNSTREAM REPO OWNER}/{DOWNSTREAM REPO NAME}/edit/{BRANCH NAME}/{DME NAME}.dme?pr={PR URL} URL to the body, or comments of the PR whenever there are DME changes.

https://github.com/{DOWNSTREAM REPO OWNER}/{DOWNSTREAM REPO NAME}/edit/{BRANCH NAME}/{FILE}.{EXT}?pr={PR URL} to the body, or comments of the PR for all files that contain merge errors