load_images.RdLoads the images from tissues to the appropriate STlist slot.
load_images(x = NULL, images = NULL)an STlist
a string indicating a folder to load images from
an STlist with images
This function looks for .PNG or .JPG files within a folder matching the
sample names in an existing STlist. Then, loads the images to the STlist which
can be used for plotting along with other spatialGE plots.