[Feature] use vodozemac instead of libolm

🎯 The Goal / Use Case

Avoid using libolm, as it is unmaintained and insecure.

💡 Proposed Solution

Use vodozemac instead of libolm. Vodozemac is the official replacement library.

🛠 Potential Implementation (Optional)

make libolm optional at compile time

🚦 Impact & Roadmap Alignment

• This is a Core Feature
• This is a Nice-to-Have / Enhancement
• This aligns with the current Roadmap

🔄 Alternatives Considered

💬 Additional Context

• https://github.com/NixOS/nixpkgs/pull/506542

In nixpkgs/on nixos users will either have to allow all insecure packages or specifically whitelist libolm or picoclaw to use it. This will likely scare of new users