UI: Add Apple H.264 hardware encoder to simple mode

Adds the Apple Silicon hardware encoder as a simple mode option. For
recordings this only requires being on Apple Silicon (since we use the
Constant Quality setting), while for streaming it requires the user to
be on macOS 13 or newer (since we're using CBR).
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Gitea Version: 1.28.0+dev-477-g8b6ad49a5f