We now support startup tunes of length 64 notes*
Each note is a tuple of (number of pulses, pulse duration)
i.e (Temp4, Temp3) register values of beep subroutine

An array of 128 values is reserved at CSEG 1A70 for this feature
The array is configurable via. Bluejay configurator - which does
most of the heavy lifting

Reserve the first 4 bytes of Eep_Pgm_Startup_Tune for metadata.
This reduces the maximum number of notes to 62, but will make editing
experience a lot more plesant as we no longer have to guess tempo to
reconstruct the Rtttl.