BSE: beast-sound-engine.cc: use FOREACH_IFACE_SEQ() to work around handle seq
BSE: beast-sound-engine.cc: use FOREACH_IFACE_SEQ() to work around handle seq

Use FOREACH_IFACE_SEQ() to generate partial Convert<> specializations that
convert between remote handle sequences and Json arrays with references to
shared_ptr<>s of interface classes. By using that macro, there's no need to
add specialzations for each sequence type manually.

Signed-off-by: Tim Janik <6ec6ff229c4e1c5bbd5933ee92e6c5832ff023bb@gnu.org>

swesterfeld/beast,tim-janik/beast,tim-janik/beast,tim-janik/beast,tim-janik/beast,swesterfeld/beast,swesterfeld/beast,tim-janik/beast,swesterfeld/beast,tim-janik/beast,swesterfeld/beast,tim-janik/beast,swesterfeld/beast,swesterfeld/beast