Branding: implement internal utility

This adds the core logic of branding management. In comparison with the
previous version, we now maintain all state in Redis, which allows the
bot to seamlessly restart without losing any information.

The 'send_info_embed' function is intentionally implemented with the
consideration of allowing users to invoke it on-demand. It always
reads information from the cache, even if the caller could pass
a 'MetaFile' instance. So while this may look needlessly indirect
right now, it should begin to make sense once the command API
is implemented.

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