gom: Support boolean properties
gom: Support boolean properties

SQLite does not have a boolean column type, so we need to use integers
instead:

    https://www.sqlite.org/datatype3.html

Luckily, the gboolean type is in fact nothing but an integer.

chergert/gom,GNOME/gom,GNOME/gom,chergert/gom,chergert/gom