NewEditor creates a new Editor instance, which can be used to launch the file with the user's default IDE.

NewTemporaryFileEditor creates a new Editor instance, which can be used to launch a temporary file (containing the content that is passed into NewTemporaryFileEditor) with the user's default IDE.

Editor can be used to allow the user to directly edit content using their default IDE (set via `git var GIT_EDITOR`).

Operations contains the behaviors of the internal git package.

Interface defines the behaviors of the internal git package.