Allow loading pictures from String/ByteString as well as from files

[duncan]

We have the function

imageNewFromFile :: FilePath -> IO Image

but it'd be nice to have one for loading from already loaded image data:

imageNewFromFileData :: ByteString -> IO Image

This would probably need to use the GdkPixbufLoader api.

The function name should distinguish between the case where we're supplying an image file format and when we're supplying raw pixel data. There's already a function gdk_pixbuf_new_from_data that takes raw pixel data and meta data describing the pixel data layout.

[Alvaro]

Grandpa Charnock's Law:

You never really learn to swear until you learn to drive.

[I thought it was when your kids learned to drive. Ed.]

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