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Allow to toggle sending timestamps so we can support mmj

The built in subsystem for mac doesn't support some messages such as
SysEx. However to use mmj, the main alternative subsystem, no timestamp
needs to be sent otherwise mmj doesn't send the messages.

As a result sending timestamps can be toggled using sendTimestamps(bool)
Added comments about SysEx and MMJ in advanced example
Some more note and comments about MMJ
Some more details about MMJ