- Disable obs-x264 plugin and forcibly disable libx264 detection due to licensing
incompatibilities with distribution policies.
- Prefer OpenH264 as the supported H.264 encoder backend.
- Make obs-browser and obs-websocket optional and disable them in-tree, allowing
usage as external plugins instead.
- Adjust UI logic to only expose x264 when the encoder is actually available.
This aligns OBS Studio with distribution licensing requirements while keeping
functionality available via supported external components.
