Standardize code

[ischoegl]

Changes proposed in this pull request

• Replace redundant compositionMap by Composition
• Eliminate unused grouplist_t and MaxExp
• Replace std::set by set

If applicable, fill in the issue number this pull request is fixing

Partially addresses Cantera/enhancements#181

If applicable, provide an example illustrating new features this pull request is introducing

Checklist

• The pull request includes a clear description of this code change
• Commit messages have short titles and reference relevant issues
• Build passes (scons build & scons test) and unit tests address code coverage
• Style & formatting of contributed code follows contributing guidelines
• The pull request is ready for review

[codecov]

Codecov Report

Merging #1565 (2f8ed63) into main (4dd28c4) will increase coverage by 0.01%.
The diff coverage is 85.71%.

❗ Current head 2f8ed63 differs from pull request most recent head a7e0e46. Consider uploading reports for the commit a7e0e46 to get more accurate results

@@            Coverage Diff             @@
##             main    #1565      +/-   ##
==========================================
+ Coverage   70.47%   70.48%   +0.01%     
==========================================
  Files         379      379              
  Lines       59093    59093              
  Branches    21230    21230              
==========================================
+ Hits        41643    41653      +10     
+ Misses      14369    14360       -9     
+ Partials     3081     3080       -1     

Files Changed	Coverage Δ
include/cantera/base/AnyMap.h	80.00% <ø> (ø)
include/cantera/base/Array.h	82.75% <ø> (ø)
include/cantera/base/global.h	81.81% <ø> (ø)
include/cantera/base/utilities.h	96.66% <ø> (ø)
include/cantera/equil/MultiPhase.h	100.00% <ø> (ø)
include/cantera/equil/MultiPhaseEquil.h	90.47% <ø> (ø)
include/cantera/kinetics/BlowersMaselRate.h	97.50% <ø> (ø)
include/cantera/kinetics/Kinetics.h	32.66% <ø> (ø)
include/cantera/kinetics/ReactionPath.h	67.44% <ø> (ø)
include/cantera/kinetics/StoichManager.h	95.46% <ø> (ø)
... and 32 more

... and 3 files with indirect coverage changes

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[ischoegl]

Applied the items from Cantera/enhancements#181 that are easiest (mostly removing the redundant compositionMap typedef). I can add more, but won't unless prompted.

[ischoegl]

Rebased and ready for review. Doxygen bits moved to #1567.

[speth]

For the remaining items in Cantera/enhancements#181, I'd suggest bundling them into a single PR. I don't think splitting this across several PRs is particularly helpful to the review process.