glib-2.0: Add optional "base" parameter to *.parse/try_parse() of integers
glib-2.0: Add optional "base" parameter to *.parse/try_parse() of integers

Appending optional parameters to method implementations in VAPIs is not an
API break.

Fixes https://gitlab.gnome.org/GNOME/vala/issues/223

GNOME/vala,GNOME/vala,GNOME/vala,frida/vala,frida/vala,frida/vala,frida/vala,GNOME/vala,frida/vala