Splitters are supported, but Mergers are not. Still a bit buggy,
but it's definitely a start!

SerialInput: Fixes minor bug, caused by weird Juce::Array constructor that caused the list of supported baudrates to contain additional items.

Previously, every event would be saved multiple times if
it passed through multiple processors. Now,
GenericProcessor::getNumSamples() checks for existing TTL
events and changes the processor ID (byte 2) to zero.
If the RecordNode encounters an event without a positive
processor ID, it will ignore it.

The only potentially dangerous thing about this is that it
involves modifying the MidiBuffer. But as long as the size
of the buffer doesn't change (just the value of certain
bytes), this should be fine.