v6.3-beta

• Fix not reloading saved assets properly, causing them to be re-downloaded. Thanks @vlad-patras!
• Fix case where after app restart if a thread is archived soon after some assets may be likely to be missed. Thanks @vlad-patras!
• Futher fixes to subject sanitsation.

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