Revert "get __version__ from package metadata"

Dies reverted den Commit 84aa87a2.

_version.py

-# coding: utf-8
-# file generated by setuptools_scm
-# don't change, don't track in version control
-version = '0.0.2.dev0+gb93bf20.d20220303'
-version_tuple = (0, 0, 2, 'dev0', 'gb93bf20.d20220303')

src/icartt/__init__.py

 from .dataset import Dataset, StandardNormalComments, Variable, Formats, VariableType
 
+# TODO: add __version__ ?
 
-def get_version():
-    try:
-        # Python >= 3.8
-        from importlib import metadata
-
-        return metadata.version("icartt")
-    except ImportError:
-        # Python <= 3.7
-        import pkg_resources
-
-        return pkg_resources.get_distribution("icartt").version
-
-
-__version__ = get_version()
-
-
-# TODO: add __all__ = ("names of exported classes etc.",) ?
+# TODO: add __all__ = ("names of exported classes etc.",) ?
\ No newline at end of file