"orog" program seg faults on MACOS

[GeorgeGayno-NOAA]

When adapting the develop branch of the ufs-srweather-app to the MACOS platform, I found that the orog program would consistently exhibit segmentation faults for unknown reasons with my compiler (GNU 9.4.0 homebrew). We have seen this before for certain older fortran programs using GNU compilers when declaring variables as a size of a variable value in certain instances (e.g. #245). I was able to determine this was occurring during the variable declaration/allocation step in the "TERSUB" subroutine.

Solution:
Given the impressively discombobulated state of that code, I decided it was best to reorganize the variable declaration section, change all variable-sized declared arrays to allocatable arrays, and allocate/deallocate those arrays as needed. This fixed the segmentation fault issue for MACOS, and had the added benefit of reducing the peak memory usage of this program by ~30%!

I also removed some unnecessary looping through indices for the assignment of values in matrices; I expected this would speed up the code but it ended up having no effect. Still is better coding practice so I left those changes in.