In `get-file-list`  there is a filter argument that can be passed to the 
function such that when going through a directory it'll only list directories 
and those files in the filter (separated by a semicolon). This can get rather 
unruly when the filter is rather large. At current count, I have a filter of 14 
different file extensions accounting for spelling or case (e.g. 
"*.jpg;*.jpeg;*.JPG;*.JPEG"). Is there a way to do this more programmatically? 
I don't mean using a procedure to create the string, but that instead of a 
string it'd be, say, a predicate.

In various GUI programs, the selection would be simply "All Images" or "Any" 
without specifying exactly what list of file extensions it's filtering. I 
suppose that behavior itself is fine, which would mean hiding the file 
extensions from the filter choice and only showing the name of the filter.

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