Enums/bitfields have a C identifier, a GLib nick, and a GIR name. The
last two are usually the same except the nick uses '-' and the GIR name
uses '_'. It is confusing.
Blueprint tries to use GIR names for everything, but GTK requires a C
identifier or GLib nick for enum and bitfield values. Blueprint was
sometimes passing the GIR name through instead of finding one of the
other names. Fixed by always emitting the C identifier for enums and
bitfields where the GIR type is known.
When only one flag is specified, it's parsed as an IdentValue rather
than a FlagsValue, so IdentValue needs to be able to type check flags
(aka bitfields) properly.
Fixes#47
