add support for Hydrus Image Parsers

[Meisterlala]

The Hydrus Network has a special file format, that describes information about a website/API. It is used to get all the images from a supported website. These files are also able to be user generated.

If NekoFans were able to read these files, then we could very easily add support for a lot of new websites/API by importing the already made Presets.

Here is a full list of websites/APIs that Nekofans could add if it could read the file format.

These 'downloaders' also provide additional metadata about the images that could be displayed by nekofans. A lot of data would also need to be ignored.

Additional info can be found on the Hydrus Wiki

Help with this is appretiated, a simple proof of concept or a way to convert these parser .png files into a usable format would be great. Nekofans could include these .png files in the build of Nekofans and parse them dynamically at runtime. Or we somehow convert them ahead of time into and save it in a simplified form