BREAKING CHANGE: Reworked image upload, using IFormFile instead of byte arrays

[Metawolve]

I replaced the old API endpoint which took a byte array as string and replaced it by two API endpoints. A Post endpoint which takes a IFormFile as input and therefore allows file uploads, and a Put endpoint which allows replacing a file with the same id.

BREAKING CHANGE: I also changed the fursuit badge registration: Instead of passing a byte array with the image data, an image id is passed. So adding a fursuit badge registration is now a two-step process with first uploading the image using the image endpoint and then passing the image id.

Before:

{
  "BadgeNo": 6,
  "RegNo": 6,
  "Name": "Meta",
  "WornBy": "Meta",
  "Species": "Protogen",
  "Gender": "male",
  "ImageContent ": "longByteArrayWithImageData",
  "DontPublish": 0,
  "CollectionCode": "123"
}

After:

{
  "BadgeNo": 6,
  "RegNo": 6,
  "Name": "Meta",
  "WornBy": "Meta",
  "Species": "Protogen",
  "Gender": "male",
  "ImageId": "10e3fbf7-7703-4b82-b960-931b54c000f2",
  "DontPublish": 0,
  "CollectionCode": "123"
}