OpenForge 2.0 Tudor External Diagonal (Cross Beams)

I'm continuing to round out the upper level of the tavern. We needed some diagonal tiles for the upper level of the front entrance. External diagonals are a tough problem. I considered a number of designs, bug finally went with this. It will work in any circumstance, but doesn't always create a clean diagonal surface. If it's a problem for some designs, let me know, and I'll make a second set that has the wall cut out instead of in.

There is also a version [without cross beams](http://ww