Future proof project structure

feat

• simplified the naming scheme for proxies (no need for http_s, only http) using an enum
• each proxy must implement a create method
• reworked the process of creating, starting, and stopping proxies (in case the config is invalid, do not start any proxy)
• updated logger to produce structured logs (possibly human readable in case of debug mode)
• simplified the process of importing vulnerabilities into proxy

refactor

• vulnerability's check method was renamed to check_and_exploit for clarity
• reworked the ProxyHTTP for clarity
• reworked both vulnerabilities for clarity
• updated typing
• removed old test files

chore

• Bumped project version

fix

• vulnerability CVE-2014-6287 is exploited only if the command exists

docs

• added docstrings

Closes #7 (closed)