ImageIO library doesn't export any public functions itself. It just contains loaders and savers
for various image formats and thus is used by functions such as LoadBrush(), LoadBGPic()
or SaveBrush(). Therefore, when using Miniwood you need to load imageio library whenever you
want to load or save image files.
The library is also available in a lightweight variant named imageio-lite which doesn't
contain any inbuilt loaders and savers but uses the ones provided by the host operating
systems instead. See Lite versions of libraries for details.