Flatpak prep, responsive UI, PipeWire visualiser backend & more

What's Changed

• V0.12.0: Adaptive UI, performance improvements & Flatpak prep by @htkhiem in #28
• Bump openssl from 0.10.68 to 0.10.70 by @dependabot in #26

Full Changelog: v0.11.0-alpha...v0.12.0-alpha