Add check on ascii text file difference in github action verification

[johodges]

Current github action verification does not check that the fds file does not change. It is pretty easy to check with the geom case, but the obst case may have minor variations in the XB. What are the team's thoughts on a hard check that the text files are the exact same versus allowing minor variations in the obst XB's?

[mcgratta]

I suggest we use the images as the final arbiter. It can be maddening to constantly swap in new references files for minor little differences.

[johodges]

That is fine for testing the obst/geom and the fuel type/texture that is generated, but it won't test &TIME and &WIND lines which we are passing in as well. It is not critical to test these now. Once we are pulling in more detailed wind maps we may want to output a 2-D terrain slice with wind and render an image on that to verify.