Python cleanup and refactor

This merge request would resolve both #28 (closed) and #29 (closed)

What it generally does is :

• remove mine_translators.py
• merge both json generators into generate_json_episodes_lists.py
  • The script now takes output files as arguments instead of printing it out to stdout
• refactor and upgrade renderfarm-lite.py

What it specifically did is :

• Add typing
• replace os and os.path with pathlib.Path
• use f-string for string formating
• split some large functions into smaller ones
• refactor how some functions works
• change and add missing docstrings
• replaced UTF-8 arrows with -> to avoid some problem on windows
• made files (mostly) complient with python linters (tested with prospector -s veryhigh -F -w bandit -w mypy --max-line-length 88)