RC4 Analysis

[SriramKirthivas]

Added analysis scripts to look at RC4 usage and overall TLS hygiene across the scanned servers.

• rc4_analysis.py - pulls out hosts still using RC4 from the scan records.
• rc4_hygiene_pipeline.py - computes a hygiene score per host (RC4, legacy TLS, expired/self-signed certs, no forward secrecy,untrusted chain), breaks it down by software/provider, and flags anomalous clusters worth following up on.
• rc4_figures.py - generates the charts for the above.
• run_rc4_analysis.sh - runs all three in sequence, automatically picking up the latest scan results folder.

No new scans were run, this is all based on the existing scan data.