Revert "add other file exports to file.js"

This reverts commit a707110299.

src/load/file.js

@@ -100,6 +100,4 @@ function load_file(file, opt) {
     });
 }
 
-Object.assign(load_file, { SVG, OBJ, STL, TMF, GBR, PNG: pngLoad.PNG });
-
 export { types, as_buffer, load_data, load_file, load_file as load };