properly identify and log sysex strings received from mirage

[mogrifier]

sysex midi callbacks are not going where expected as evidenced by logging. Put in a standard function that can identify the strings by their header and display the data.

[mogrifier]

I am suspicious I only need a single midi callback function, that can demultiplex midi sysex from the mirage and save to a global stack (push and pop). Need to investigate.