Modularized bitset cpp

[jvdp1]

Based on #1031, #1033
Closes #1049

Here is a proposition to modularize stdlib using cpp directives (instead of fypp) based on this comment

\cc: @eduardz1 @jalvesz @perazz

[jvdp1]

here is a proposal (to replace #1049) that relies only on the CPP directives.
The code using bitsets is always generated and encapsulated between the cpp directive STDLIB_BITSET.

@jalvesz : I didn't look carefully to fypp_deployment.py as it results in many errors on my computer. If we are all happy, I can have a look later.

[jalvesz]

Thanks for this new approach @jvdp1. One question though, I didn't see the header file defining the default value of the internal define parameter. If so, one would be obliged to pass a flag even when building with a compiler that does support it, right?

[jvdp1]

One question though, I didn't see the header file defining the default value of the internal define parameter. If so, one would be obliged to pass a flag even when building with a compiler that does support it, right?

Sorry I forgot about it. I will add one, such that the default is the compilation of bitsets.

[jvdp1]

@jalvesz : I added a file macros.inc, such that the default is the compilation of the whole stdlib (i.e., including stdlib_bitsets. The user must pass the flag STDLIB_NO_BITSET to avoid its compilation.

However, I think that the file macros.inc is not required if the directive
#ifdef STDLIB_BITSET
is replaced by
#ifndef STDLIB_NO_BITSET

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 25.13%. Comparing base (fffe0d7) to head (7b1b1ea).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1050      +/-   ##
==========================================
+ Coverage   25.12%   25.13%   +0.01%     
==========================================
  Files         570      570              
  Lines      234201   234201              
  Branches    41277    41275       -2     
==========================================
+ Hits        58838    58872      +34     
+ Misses     175363   175329      -34     

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