We don't need this code any more as we're using the texture class to render our
image objects now. There are still some functions inside of `image.c` which
we'll be able to remove once tilesets are also using the new rendering code.

The existing code to render images would take images in other formats like
blue/green/red ordered pixels (BGR) and then convert those to RGB. This patch
moves those changes out to a function so we can re-use it :)

We don't hold onto the 'format' of the image anymore, but we can still read
this from the surface when creating a texture and this seems to work fine :)

This condition would check if we failed to create an image and present a
helpful error message. We don't use the same C code for loading images
anymore and so it may be better to handle this inside of the Texture
class, as Texture will get a blank array instead of useful arguments.