Preview saved orders feature from vDip

This branch includes the cherry picked save orders feature from vDip, with some additional improvements:

* The map navigation buttons no longer receive clicks when the blank space between the buttons is clicked
* The map navigation buttons have a little more padding to improve usability on mobile
* When move preview is active, the (hidden) map navigation buttons no longer work while they're hidden.
* The "remove arrows" button from vDip been removed, and the javascript now works whether or not the button to be present.

Tested manually by verifying that moves, builds, supports and retreats display correctly on the classic map.