This heavily reworks media handling in various areas. More media checking has been moved from the bot code to the media processing code/server, a single request is now used to both check the media type and get the full buffer, some areas have been simplified, and a good amount of cleanup was performed overall. This also makes the text input in uncanny required, removes URL filtering on certain commands, and removes the URL/filename arguments from the params/criteria functions. As this info is now obtained during image processing, it is no longer accessible beforehand.