Feature request: reset all cards

[mrash2]

Consider adding a button that allows the player to reset all the items to their original positions to start over. This request came about because we noticed that it is possible to drop an object behind a folder in such a way that it isn't detected as 'in' the folder, but cannot be selected to move it again. The reset would address that situation and also might be nice on larger qsets anyway.

[clpetersonucf]

This took a minute to address, but the underlying issue is now resolved via #63 👍

[clpetersonucf]

Scratch that: reopening as a "reset all cards" option would still be useful.