Add the fmt_image() function
#1240
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Inserting graphics into tables currently is a bit more difficult than it should be. It requires a combination of
text_transform()+web_image()/local_image()and it occurs late in the gt pipeline.With
fmt_image(), this process becomes quite a bit easier. The cell data need to point at filenames or have data that can be fashioned into filenames (through afile_patternargument). An optional path can be provided to keep the required inputs minimal on the input table side. Multiple images can be inserted into individual body cells by having comma-separated file references.