Better routing, probe fixes, plugin updates in Freenet/Hyphanet 0.7.5 build 1507

This routine update to the decentralized, censorship-resistant Freenet/Hyphanet network fixes a real privacy vulnerability in probe requests that could have weakened user anonymization, a core promise of the platform. It also marks a significant technical transition away from Java 8 toward Java 17, reflecting how aging infrastructure dependencies force maintenance tradeoffs even in niche, privacy-focused software projects.

• Independent security researchers found and reported a bug where probe requests lacked location randomization, undermining anonymity; the fix adds randomized noise to protect user privacy.
• This is the last Freenet/Hyphanet build to support Java 8—future updates require Java 17, and nodes on older Java versions won't get further updates without emergency intervention.
• The project uses Shamir's Secret Sharing Scheme to distribute update-key shares among trusted developers, ensuring resilience if the new update key is ever lost.