v6.4.39 release

• Improved subtitle and audio track names with disposition-aware labels
• Movie scraper now retries searches without diacritics for better matches (german)
• Improved scraper accuracy for TV and movie detection from messy filenames
• Better handling of remakes, numeric titles, and country hints when scraping
• Audio delay preference is saved immediately when toggled or changed
• Disabled unsupported positive audio delay in passthrough modes
• Improved audio/video sync handling for manual A/V delay and AC3 recoding passthrough
• Address one source of sound gaps with AC3 recoding passthrough
• Fix media database crash when connection gets closed