Pykeypass

Changes:
- Refracted code. Changed the path_selection() function to multiple return instead of returning a list.

Changes:
- Additional of unit tests in preview version broke some of normal functionality (go figure...). Functionality is restored and code refactored to ensure tests are running on a better representation of real world functionality.

Changes:
- Implemented unit tests via pytest (94% coverage)

- Added pykeypass setup command to install.bat to facilitate setting everything up when tool is initialized
- Note: Linux is not quite functioning yet. Ideally linux users should to use pip install --editable . followed by pykeypass setup in terminal to get everything setup. However, the second statement simply prompts the error handling that should only appear if trying to run the command for the first time outside of the root directory (only tested in Windows 10 WSL Ubuntu).