Two easy fixes for better printing support

Better printing could be implemented with almost no effort with just two features:

• Similar to the Green Screen Background, have a pure White Background ( or even better, pick-your-color )
• Similar to the "Dark Void" special floor tile, have a pure White Tile (or again, let me pick the color on tiles )

Going one-step-better, instead of having to create your map with those, have an option during export to act as-if all your floor tiles were white.

Here is why: For printing large-format maps, I often do "Blueprint" printing, which only cost me a couple of dollars to print up to 36"x48" chart. The only catch is that that they limit you to something like 30% ink. If the background of the map is removed, and I am left with just the grid, walls, and the objects, than I most likely will meet that. If not, I need to remove a few objects until I do.

As it is right now, I use the Green Screen and the Pure Void tiles manually, but it is really hard to edit them both out properly since black shows up on objects all the time.