(Towards #2586) Add support for object-oriented var =[>] this[%...]%procedure(...) assignment

[JulienRemy]

Currently pointer assignments of the form var =[>] this[%...]%procedure(...) are CodeBlocks wrapping fparser Function_Reference objects.
This converts them to assignments with a call on the rhs.

Notes:

• a workaround was required to deal with some fparser Intrinsic_Function_Reference, wrongly parsed as Function_Reference fparser/#447 and associated TODO comments.
• this does not deal with the Structure_Constructor case mentioned here so it does not close Add support for Calls to StructureType members #2586.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.86%. Comparing base (d92f13f) to head (b974455).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2649   +/-   ##
=======================================
  Coverage   99.86%   99.86%           
=======================================
  Files         352      352           
  Lines       48507    48509    +2     
=======================================
+ Hits        48442    48444    +2     
  Misses         65       65           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[arporter]

Hi @JulienRemy, I can't remember what you said about PRs on Monday. Was this the one that's ready for a review?

[JulienRemy]

Hi @arporter, this one is indeed ready to review when you have time for this.

[arporter]

Looks good, thanks Julien. Just one small refinement and then this can go on.
No need to update any docs as this is a bug fix/workaround.
I'll fire off the integration tests now.

[arporter]

Requested change has been made (thanks).
Integration tests were all green (although I'll re-run them).
Will proceed to merge.

[arporter]

Integration tests were green.