implemented image upload and cropping system, mostly work. it's too zoomed in and appears to be using the xy coords from the top left of the crop selector.

js/upload.js

@@ -0,0 +1,12 @@
+const file_inputs = document.getElementsByClassName('file_input');
+const filename_displays = document.getElementsByClassName('file_input_feedback');
+
+for (let i = 0; i < file_inputs.length; i++) {
+  file_inputs[i].addEventListener('change', function() {
+    const selected_file = event.target.files[0];
+    if (selected_file)
+      filename_displays[i].textContent = 'File uploaded: ' + selected_file.name;
+    else
+      filename_displays[i].textContent = 'No file selected.';
+  })
+}