Feat/refactoring

[lesion]

some refactoring addressing recent issues and some bug fix:

• firejail was not working anymore with the addition of --firejail-args (it was threating the argument also if it was empty)
• reuse host's tor cache directory for faster loading / Suggestion: Reuse the Tor cache directory in the system for faster loading #45
• add iptables enforcement / orjail leaks non-TCP/Tor packets if forwarding is enabled in the main OS. #43
• refactoring error handling
• general cleaning