Added a config argument to hysr_visualization

[jan1854]

Description

This adds the option to pass a config file as input to hysr_visualization, which is needed if there are multiple json files in the current directory (e.g., different configs for training and evaluation).

How I Tested

Ran hysr_visualization and hysr_visualization config.json.

I fulfilled the following requirements

• All new code is formatted according to our style guide (for C++ run clang-format, for Python, run flake8 and fix all warnings).
• All new functions/classes are documented and existing documentation is updated according to changes.
• No commented code from testing/debugging is kept (unless there is a good reason to keep it).