Overlay orders and restrictions are wrong

[hobnob]

Affected Scenario(s): 73

Describe the bug
From reddit:

So a bug I noticed on scenario #73. When you move an object onto a purple hex (difficult terrain in this one), the object disappears and you have to undo to get it back. Also a problem on this one is that objects and traps cannot occupy the same space.

Kinda unique due to the mechanics of this scenario but hopefully, in Frosthaven, we will be seeing more strange map designs like this.

** Potential Fix **
If we change the order overlays are ordered they can be placed on top of hazards like water. It was also reported that you can't place things on doors, so this restriction should also be removed. We should probably have an order similar to this:

• Door
• Hazard
• Diffficult Terrain
• Treasure
• Obstacle
• Trap
• Player/Monster
• Loot