move part of dunepackaging.py to python/dune/common/dunepackaging.py

to automate generation of metadata for setup.py for other modules

[bug fix] previous commit

move files around a bit to be able to use the metaData extraction
from dunepackaging.py

use more of the cmake variables in python/setup.py.in

fix an issue in dunepackaging.py for modules without a python package

- remove CMakeCache.txt file in dune-py
- check that pyproject.toml file contains all dune module dependencies
  mentioned in dune.module to check consistency

[bug fix] previous commit

add dune modules from pyproject.toml to install_requires in setup.py

[bug fix] previous commit

added files generated when calling python setup.py sdist to git ignore list

Update bin/dunepackaging.py.

Add path to dunepackaging if dune-common.

Append version number devDATE to -git versions and add suggestions if they have a pypi package.