Fix crashing on droping text (#302)

* Add basic drop overlay

* Prevent crash when dragging text

* Only show popup when files are being dragged

* Make drop box bigger

* Make drag drop overlay without a modal

* Don't show drag drop menu on top of modals

* Use different way to check for modal

src/app/organisms/drag-drop/DragDrop.scss

@@ -0,0 +1,12 @@
+.drag-drop__model {
+  box-shadow: none;
+  text-align: center;
+
+  .text {
+    color: white;
+  }
+}
+
+.drag-drop__overlay {
+  background-color: var(--bg-overlay-low);
+}