v0.6.0

• Added initial support for backfilling threads.
• Exposed Application flag to displayname template.
• Changed m.emote bridging to use italics on Discord.
• Updated Docker image to Alpine 3.18.
• Added limit to parallel media transfers to avoid high memory usage if lots of messages are received at the same time.
• Fixed guilds being unbridged if Discord has server issues and temporarily marks a guild as unavailable.
• Fixed using guilds bridge command without --entire flag.
• Fixed panic if lottieconverter isn't installed.
• Fixed relay webhook secret being leaked in network error messages.