Command Line Options - relative paths inconsistent

**Describe the bug**
The path for `-hyde-yaml-dir` and `-hyde-src-root` is relative to the directory containing the file being processed. i.e.
```
hyde ./include/psutil/safe_cast.hpp -hyde-src-root=../../include -hyde-yaml-dir=../../docs/include
```
Here the path `../../include` is relative to `./include/psutil/` and not the current working directory.