Including PyGObject

I'm trying to use PyOxidizer to build a [zim](https://github.com/zim-desktop-wiki/zim-desktop-wiki) binary, however it fails as with the following message:

```
Traceback (most recent call last):
File "zim", line 40, in
File "zim.main", line 22, in
File "zim.fs", line 27, in
File "zim.signals", line 7, in
File "gi", line 42, in
ImportError: cannot import name '_gi' from 'gi' (unknown location)
ERROR: Could not find python module files in path:

Try setting PYTHONPATH
```

The required package is [PyGObject](https://pygobject.readthedocs.io/en/latest/getting_started.html), is it possible to link it somehow into the app?

Start with the failing imports in zim.main, zim.fs, zim.signals, and gi, then read the PyGObject getting-started documentation linked in the issue. Determine whether a PyOxidizer-built application can package PyGObject so the gi import finds _gi; done means the zim binary starts without this ImportError.

Written by the indexing model from the issue text.