v6.4.32 release

• Upgrade TMDb poster and backdrop image quality (requires a full rescrape of the video collection)
• Refresh remaining scrape count when new items arrive during an ongoing auto-scrape
• Fix potential deadlock and harden burst writes in audio passthrough mode
• Fix audio/video sync issues in passthrough mode and with PCM decoding
• Remove redundant poster downscaling and clear image cache on upgrade to use higher-quality images (saves storage space)
• Fix Jetty log flooding caused by repeated ServerConnector accept() errors on Android
• Add audio decoder preference to choose between software (FFmpeg) and hardware (MediaCodec) audio decoding
• Display MediaCodec audio capabilities in the leanback information tile while playing