Deliver MIDI events to atom ports that support it, merged with transport events.

Eliminate delivery of non-MIDI events to Ardour MIDI buffers.
Fix the general mess of LV2 port flags and types.
Unify old MIDI API and new atom API MIDI stuff.

Making this work required changing the way we do LV2 MIDI slightly: instead of
BufferSet::get_lv2_midi doing the translation automatically, it returns an
empty buffer and the caller is responsible for actually filling it.  This
allows the LV2 code to iterate over the MIDI and transport changes in one go to
merge them into the buffer at the correct times.

Synth plugins using the new atom API now work and can get accurate transport
information along with the MIDI that drives them.


git-svn-id: svn://localhost/ardour2/branches/3.0@13522 d708f5d6-7413-0410-9779-e7cbd77b26cf

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