Interface introspection

[Joe Shaw <joe helixcode com>]

So, I was chatting a bit with Miguel about whether bonobo has the ability
to ask components for the interfaces they support. This is particularly
useful for querying remote components, since you can't just access the
oafinfo file. Miguel suggested that we create a standard interface like
"ComponentProperties" to Bonobo_Unknown so that it could be queried and
return this kind of information.

Comments?

Joe