FieldVector/Matrix classes with low dimension

add all flags to pybind11 modules

move bin files and cmake modules from dune-python
add sphinx support from dune-python

Merge branch 'fix/typo' into 'master'

See merge request [core/dune-common!789]

  [core/dune-common!789]: Nonecore/dune-common/merge_requests/789

Merge branch 'fix/typo' into 'master'

See merge request [core/dune-common!788]

  [core/dune-common!788]: Nonecore/dune-common/merge_requests/788

Merge branch 'eigenvalues_for_float' into 'master'

ref:core/dune-common\> This MR adds support for computing the eigenvalues and
vectors for FieldMatrices of field_type float

See merge request [core/dune-common!787]

  [core/dune-common!787]: gitlab.dune-project.org/core/dune-common/merge_requests/787

is not double or float

with field_type float