[Shadekeep]

At last, the much-requested Megahexes feature is in. Look for a new Layer of the same name. This includes tools for turning the megahex overlay on and off, and nudging it around so that the megahexes are just where you want them. They should save correctly in save map and images, too. This change should not break any previous maps.

Also added is a simple bit of code to capture when you reload or navigate away from the page. It will ask you whether you are sure you want to do that, and you can cancel the redirect in case you have unsaved work. This should help prevent losing work by accidentally hitting reload or a link.