Release 1.47.1

This is the first release of the 1.47 cycle, matching
GLIb 2.47.1.

I'm happy to say that gobject-introspection patch review
is moving again, and we landed a number of contributions
in the last month.

For distributors, a notable change is many patches to attempt to add
Python 3 support.  Please give this a try.

There are a few new warnings about e.g. using (allow-none) for an
`int` variable, etc.  This may trip up projects using `--warn-error`.

Contributions from:

Ben Boeckel (1):
Ben Iofel (1):
Chun-wei Fan (13):
Colin Walters (18):
Damien Grassart (1):
Garrett Regier (5):
Giovanni Campagna (1):
Michael Catanzaro (1):
Mikhail Zabaluev (5):
Philip Chimento (1):
Philip Withnall (7):
Rico Tzschichholz (2):
Simon Feltman (26):

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