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The enums provide a convenient way to select the type of 1d3d coupling mode.
However they are not extensible. Adding a new mode requires changing Dumux core code.
With the new comparable and named tags, we have the same features but in
an extensible way. Every coupling manager implementation can define their own
(unique) tag and specialize the common class with this tag. The coupling mode
can be queried as before, and it is still easy to write code that works
with several coupling modes.

This commit also puts all coupling mode specializations in their own headers.

[test][channel] put Scalar alias outside subgrid guard

See merge request !2286

[doc][doxygen] Improve description of doxygen group geometry.

See merge request !2284

Feature/fix walldistance

See merge request !2224

[rans] Introduce a struct for the wallElementinformation, change HasChannelGeometry to IsFlatWallBounded, fix maximum/minimum velocity names (remove profile, add comments), flowNormalAxis to flowDirectionAxis,  sandgrainroughness default.

* Include non-  normal axis distances
* Cleanup wall and flow normal axis variables
* Include scvf corners as possible wall locations

Doxygen for 3.3

Closes #920

See merge request !2258

[test][bBoxTree] Adapt to change in Dune::AxisAlignedCubeGeometry

See merge request !2283

* for dim != dimworld, an axes object needs to be passed to the ctor

Revert "Merge branch Dune::power for std:pow and integer exponent"

See merge request !2279

This reverts merge request !2263

Merge branch '880-performance-math-replace-std-pow-scalar-int-with-dune-power-scalar-int-or-write-product' into 'master'

[cleanup] replace std::pow(Scalar, int) with Dune::power(Scalar,int)

Closes #880

See merge request !2263

[test][spline] Set gnuplot.setOpenPlotWindow(false) to avoid gnuplot timeout

Closes #939

See merge request !2273

Feature/python bindings

See merge request !1985

[cleanup][test] Remove try/catch exception handling from all tests

Closes #915

See merge request !2266