Fix member groupings in doxygen

[ischoegl]

Changes proposed in this pull request

• Update formatting of doxygen member groupings
• Update formatting of doxygen module groupings

Per #1275, there are two working formatting variants of member grouping commonly found (while others don't work and don't produce the expected output). This PR consistently applies the following

\\! @name GroupName
\\! description of the grouping
\\! @{
[...]
\\! @}

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

Closes #1275

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

[speth]

Thanks for working through this, @ischoegl. I know this kind of comment reformatting can be a bit tedious. I had only a couple spots where I think there were some additional things worth cleaning up.

[ischoegl]

@speth ... done. It was tedious, but searching for @name in VSCode is actually not too bad.

[ischoegl]

Ended up taking care of module groupings also, so every grouping is now formatted consistently

[speth]

Thanks, @ischoegl. Hopefully, having the existing style for these be consistent will encourage consistent usage in the future as well.