GET /images/uuid.filetype DONE
 -> returns the image with the correct filetype - uuid.png would return the image in png format, etc

GET /images/by-user/username DONE
 -> gets all of the images made by {username}, if you are {username}, or if you have admin.

POST /images/create {image: "image data"} DONE
 -> returns the uuid of the image, which it saves to the folder and database

DELETE /images/uuid DONE
 -> if you're the owner of the image or an admin, deletes the image. returns basic success/faliure

images are stored in /images/uuid.png. Image::get_by_uuid(uuid) just gets the image from the folder, verifies that it is an image, and returns it. Image::get_by_username(username) gets all database images from the database and returns the uuids. the client is responsible for getting the images.