Add more control how file paths in output are formatted

Description

Currently file paths in output are relative to the analysis folder, e.g. if you do repomix . in project folder, and it has src/main.py, you'll see: <file path="src/main.py">

Sometimes you have an extension of project's source code that's in a different folder from current working directory, e.g. ../core-library/. So then you can do repomix ../core-library/. E.g. this one has file src/core.py, and in output you'll see: <file path="src/core.py">

Suggestion: add optional modes how these file paths should be formatted in the output. E.g. in this case it would be preferrable to instead have <file path="../core-library/src/core.py"> in the output, which is relative to the current working directory.

I'm trying an approach where if it's a smaller project, I ask agent to run repomix and get all project-related source code into context. But this pathing makes it forget that not all files are under the current working directory, so it wastes time searching for the file in current working directory, then realizes it's not there, and goes to the correct folder.