(Towards #428) Implementation of the Fortran2008 intrinsics

[LonelyCat124]

I attempted to add the Fortran2008 intrinsic in an extensible and similar way to the current.

I couldn't name it Fortran2008_Intrinsic_Name as the stuff in the Fortran2008.init.py stuff breaks the Fortran2003 setup because it makes a new Name class for Fortran2003 which matches every string.

Ready for a review from @arporter or @sergisiso once I fix any formatiting issues.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.27%. Comparing base (ea5c601) to head (fd6da0d).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #514      +/-   ##
==========================================
+ Coverage   92.24%   92.27%   +0.03%     
==========================================
  Files          88       89       +1     
  Lines       13866    13881      +15     
==========================================
+ Hits        12790    12808      +18     
+ Misses       1076     1073       -3     

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[sergisiso]

I triggered PSyclone CI with this, as it would be good to include it in the next release.