Add HSBuild project files
Replace git-version-gen script with our hacked version
Work around broken close() binding on Windows

This is obviously a hack.
gio-2.0: Fix GDBusConnection constructor signature

The `guid` argument is nullable.
Optimize (de)serialization of (u)int8 arrays
gio-2.0: Fix DBusConnection `closed` signal binding
Target GLib 2.42 by default