6x6 navigation improvements: Next part selected by default + choosing Max no of parts

[BrennanSingularSound]

@alexicon

1.- Next part should be by default selected. I should need to take actions (select another part) only when I want to interrupt serial operation. Otherwise Aeros should just follow BeatBuddy, switching from part to part serially, like it does in 2x2, without having to press any extra buttons. For this to happen the only thing you need to change is having the next part selected by default .

This is already done in 5.0.0 beta which is out since Christmas, we have a setting to allow Auto Song Part changes

We are still looking into whether we will be doing what we currently are calling N x M mode but no promises