Add functions to mo_poly.f90 to modify any polygon to work with in_poly (from branch in chs/forces)

Robert Schwepperequested to merge
add_functions_to_mo_poly into main
  • refactored code in mo_poly.f90 to mo_poly.fypp and replaced mo_poly.f90
  • added new routines orientpoly (calculate orientation of coords in polygon), mod_pole (modify coords of grid to include poles on Cartesian coord system) and mod_shift (shift longitude values by 180 degrees)
  • added test cases for new routines and refactored older ones
  • fixed a small bug in the tests/CMakeLists.txt file that ignored the *.fypp based files

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