Gave user ability to drag input tiles for reordering, and also formatted panels. Added mouse down listeners to text fields on the input panel so that text field entry has precedence over dragging.  Closes #21.

Also cleaned up library imports in two Android files.
Input panel dragging: added unit test for input panel reordering. Issue #21
Fixed merge conflicts when merging branch draggableInputTiles (corresp to issue #21) into newCreationFlow (see issue tags: Experiments-Creation). closes #21