replace std::result_of with std::invoke_result to make std20 compilation work

See merge request !757

Is available since std17

Simplify UGGrid domain creation

Closes #188

See merge request !755

Now that STD_BVP_Configure has a domain* argument, ADL is enough
to find the correct method in dune-uggrid, and the wrapper in
ugwrapper.hh is not needed anymore.

These two methods have been removed from dune-uggrid.  Instead
'domain' objects can be simply handled via new/delete.

The current code looks like it leaks to the 'domain' object,
but it probably did so before, too.  To be fixed in a
later commit.

Previously, the ConfigPtr variable stored a pointer to that method.
We don't use the extra flexibility offered by that, so let's simplify
the code and just call STD_BVP_Configure directly.

Include std headers

See merge request !752

Speed up `UGGridGeometry`

See merge request !750

In particular, we cache integrationElement, jacobianTransposed
and jacobianInverseTransposed.  This leads to speedup
for high-order methods on simplex grids.

The old implementation constructed a GeometryType object and asked
that whether it was a simplex.  Apparently this inlined badly.
The new implementation queries the UG-internal data structures
directly, which leads to a measurable performance gain.

Improve support with MSVC

See merge request !745

UGGrid has used an overly complicated way to compute the
integrationElement since practically forever.  Instead of computing
the determinant of the Jacobian of the geometry transformation,
it computed the inverse determinant of the inverse Jacobian.
This lead to a matrix inversion being performed at each call
that wasn't actually necessary.

This patch removes this pointless inversion.

The name should really point out that it is about the *inverse*
transformation.

The UGGrid code dates to before constexpr if existed, and uses
particular "pointless" casts to achieve a similar effect.
Replace some of these casts by constexpr if, which is much easier
to read.

The code is simplified further because UGGrid has recently started
to use FieldVector for point coordinates.  Therefore, componentwise
copying is not necessary anymore.

* Use dune math constants to obtain pi
* Avoid using a shell when testing on embedded python
* Make YaspGrid compatible with MSVC standard library

Move the set_package_properties(PURPOSE) for the Alberta package to AddAlbertaFlags file

See merge request !748

Fix conversion of r-value into l-value reference in discarded function

See merge request !747

Remove include of itself

See merge request !746

Update versions release 2 10

See merge request !744

[fix] Account for rounding errors on float representing version of gmsh file

See merge request !730

Update LICENSE.md

See merge request !743

Move include of config.h from source to some header files

See merge request !741

Fix bug in DUNE_GRID_EXAMPLE_GRIDS_PATH for downstream projects

See merge request !742

The recent change in dune build system (see 2039882c0a54f126553524c4d02af15df6ba619e in dune-common) showed that this variable is being set incorrectly.

Add capability checks to limit gridcheck to existing entities

See merge request !734

Revert "Merge branch 'fix/dfggridFactoryPythonBindings' into 'master'"

See merge request !740

This reverts merge request !739