(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 #2586.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

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

Additional details and impacted files

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

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[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]

Integration tests were green.