Improve filenames for downloaded assets #1232
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This changes the filenames output by DiscordChatExporter to be more meaningful (in the case of emojis and avatars) and more resilient against collisions.
The hash is 12 characters of base32 now, rather than 5 characters of hexadecimal. This allows for nearly 5 million downloads with the same name before there is even a 0.001% of a single collision. This should actually be enough, even for problematic filenames like those associated with Youtube thumbnails.
Emojis and Discord attachments are instead guaranteed to not collide as they instead contain the unique snowflake of the attachment or emoji. The 19 digit id is significantly longer than the old 5 digit ids - however, reencoding it in base32 would only save 6 characters, so better to use the more recognizable numeric form IMO.
Closes #1231