v6.4.0-beta

• Upgrade boards view to use a table (like threads).
• Fix board scraping not creating any threads.
• Fix thread file count being off by 1 when made from a board.
• Refactor downloading error handling.
• Optimise UI redrawing.

⚠️ Database will not be migrated from v5 -> v6! Copy your trackers to clipboard and paste in new version - or start fresh.