v3.21.0

• Added integration with reddits new /r/all filter.
• Added background sync of subs, multis & filters. Triggered daily when subreddit selection activity is opened.
• Added option to open a subreddit in a new activity via post options dialog.
• Added subscription status icon to view all subreddits activity.
• Added score abbreviations to align with reddit scoring change (full score still visible in info panel).
• Various bug fixes.