Add DO:Coal Maze

[RedRafe]

Adds a new Danger Ores preset: Coal Maze
Uses 2 presets we already have: maze gen (50x50, 3 wide) and coal + patches (DO).
Terraforming module has been disabled for this map.

Hopefully many trains will be used here!
Couple of screenshots:

Close up

Whole view

Biters seem dense but it's just the default enemy curve we have on every DO map. We'll see I guess. SHouldnt be a problem in peaceful mode tho

[grilledham]

Looks good. One suggestion, I'd be tempted to center the spawn in one of the maze chunks, looks a bit odd being clipped by the wall. I'll leave it up to you if you want to change that.

You have my approval to merge either way.

[RedRafe]

It does depend on how the random maze ends up being, but changing to square and translating of 2,2 kinds fixes it. If I translate it more the starting cross will be offset a lot since the spawn area does not have coordinates x,y to translate it.

I should change the map builder and have whole map accept additional x,y params to shift it whole, but maybe can be done in another PR