Added a new tool, the Generic Image Tool - allows you to convert SF2000 images to PNG, and PNG/JPEG images to SF2000 formats with several options.
Also added a large amount of arcade-specific information thanks to some heroic work by `adcockm#8175`, fixed some typos thanks to `Luke#4448`, and tracked down where an "unused" image was actually being used thanks to `kid_sinn#9691`
