[LV2] Port Groups (changes + patches: invada, swh)

[David Robillard]

Port groups extension updated, there were some errors and undefined
roles (ambisonics stuff), etc.  I also simplified the number of roles a
bit, the old one borrowed from wikipedia (and lars', which I assume was
too) and used quite a few redundant ones.  This one uses positional
stuff that makes more sense without having to read a book on surround
format terminology (e.g. "surround" is meaningless without context, but
"side" and "rear" are obvious).  It also seems to match more APIs out
there.

http://lv2plug.in/ns/dev/port-groups.lv2/port-groups.html

Attached are patches against most recent swh-plugins git, and Invada
bzr.  Calf git is still fine.  I might do ll-plugins later today (Lars
who has returned back from the dead: comments on this ext vs. your old
one?  Basically it's just a simplified and flattened version of the same
thing because the 'membership' blank node was annoying and this way
works better with dumb implementations)

(Note this is still in /dev/ so releasing things that depend on it is
probably unwise.  I'd like to move this to /ext/ soon though, pending
comments and another working host implementation)

One thought: the control group stuff seems to really not belong in this
though.  It's already a very large extension to wade through.  Maybe
those should be split into a separate file (that uses the same
predicates)?  It's much more likely to change over time...

Cheers,

-dr

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