Martin fileinfo cache 2

[schreiberx]

This is the final PR for the updates on caching fparser (and later on psyir).

This update avoids using the same file multiple times for individual modules in each file.

[schreiberx]

@arporter That's the final PR for the file info caching stuff.
It's probably best to first get the previous PR in the master.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.89%. Comparing base (2307ac7) to head (0f9cdcd).

Additional details and impacted files

@@           Coverage Diff            @@
##           master    #2833    +/-   ##
========================================
  Coverage   99.88%   99.89%            
========================================
  Files         359      359            
  Lines       50833    51067   +234     
========================================
+ Hits        50777    51011   +234     
  Misses         56       56            

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[schreiberx]

@arporter Your turn. Let's try to stay below 50 comments :-)