Allow to disable output prettification and debug code generation

[Dominic Charrier]

• Add options that prevent generation of debug code into the HIP C++ kernels
• Add options to disable prettification of generated HIP C++ code and formatted
  Fortran source

Background:

• Some applications might want to use GPUFORT as a preprocessing step in an automated
  compilation process. Output formatting is not needed in this case.

[Dominic Charrier]

Implemented.