Jello

- Add the ability to directly use a JSON file or JSON Lines files as data input (`-f`)
- Add the ability to load a query from a file (`-q`)
- Add the empty data option (`-e`)
- Fix user-defined functions in ~/.jelloconf initialization file

- Fix schema output to ensure invalid variable names are enclosed in bracket notation
- Fix to allow blank lines when slurping JSON Lines objects

- Add `__main__.py` to package for `python -m jello` use cases

- Fix scope issue in query function
- Remove old man page from source package
- Clean up tests

- Enhance error output with text wrapping

- Fix key names with spaces in Schema view