Do something when all the images are loaded (this might be easier with jQuery, but I do not know jQuery as well as plain JavaScript).
This seems like it should work, but instead it just goes back to the main menu for a while
A spinner now appears, though it is in the corner
Now the spinner appears over the overlay (also in black for better contrast)
Merge branch 'master' into fix/spinner
Load the scenario even if there are errors.
Merge pull request #37 from rcatlin/fix/spinner

Fix/spinner
Merge branch 'master' into feature/negation