Immediate-event/out-of-band injection update & tweak clearing buffers

Immediate events are used for MIDI-Panic and to inject GUI generated
events e.g. patch-changes, note-events from the track-header
(scroomer-keyboard) and patch-change audition.

Current behavior:

- snapshot copy immediate events from ringbuffer into a buffer at
  the beginning of each the cycle.
- Inject immediate events into input-buffer directly after reading the input
- process "normally"
- pass immediate event-buffer to disk-writer, so it can skip them
  (don't write immediate events to disk)
- if the Route is not monitoring input: clear buffer before disk-reader
  and re-inject (original) immediate events after the disk-reader
- immediate events process normally and are also sent to outputs.

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