The themeing options (sic) for inactive osd labels added in
cfdbe23e0d9b72b4c220a10ddf60a4e981967b63 had the fallback to inactive
label before that was read in, so fallback failed to pick up some
things.
Set version stuff to 3.5.0-rc1.
Copy the CHANGELOG from 3.4-working.
Rename the obt-4.0 and obrender-4.0 pkgconfig stuff to obt-3.5 and obrender-3.5
Rename the "render" directory to "obrender" so that the public headers can be
installed in <obrender/*>