python: don't leak local __init__.py variables to python introspection.

Causes pybind11-stubgen (and probably other tools as well) to include
`i` in the output, which feels dirty.

src/python/corrade/__init__.py.in

@@ -60,6 +60,10 @@ import sys
 for i in ['containers', 'pluginmanager', 'utility']:
     if i in globals(): sys.modules['corrade.' + i] = globals()[i]
 
+# Just to not have the variable leak into stubs generated by pybind11-stubgen
+# TODO any way to exclude it?
+del i
+
 # Prevent all submodules being pulled in when saying `from corrade import *` --
 # this is consistent with behavior in magnum
 __all__ = [

src/python/magnum/__init__.py

@@ -52,6 +52,10 @@ if 'scenegraph' in globals():
     for i in ['matrix', 'trs']:
         sys.modules['magnum.scenegraph.' + i] = getattr(scenegraph, i)
 
+# Just to not have the variable leak into stubs generated by pybind11-stubgen
+# TODO any way to exclude it?
+del i
+
 __all__ = [
     'Deg', 'Rad',