[pygobject] (9 commits) Non-fast-forward update to branch wip/jfelder/template-hierarchy-fix

[Jean Felder <jfelder src gnome org>]

The branch 'wip/jfelder/template-hierarchy-fix' was changed in a way that was not a fast-forward update.
NOTE: This may cause problems for people pulling from the branch. For more information,
please see:

 https://wiki.gnome.org/Git/Help/NonFastForward

Commits removed from the branch:

  bd8b43a... gtktemplate: Change init_template to a no-op once executed
  2dbc757... gimodule: Remove trailing whitespaces
  8024b75... gtk overrides: Fix template hierarchy issue

Commits added to the branch:

  a6799b2... Remove all Python 2 Python code (*)
  f3cb961... Remove all Python 2 C code (*)
  009cb45... Remove PYGLIB_REGISTER_TYPE (*)
  9787959... Remove PYGOBJECT_REGISTER_GTYPE (*)
  721a096... Rename PYGLIB_DEFINE_TYPE to PYGI_DEFINE_TYPE (*)
  bfa56b2... NEWS: Add a note on how to handle keeping an old release fo (*)
  ad9cfa6... gimodule: Remove trailing whitespaces
  622ad8e... gtk overrides: Fix template hierarchy issue
  715ead5... gtktemplate: Do not crash on multiple init_template calls

(*) This commit already existed in another branch; no separate mail sent