Feature proposal: Improvements for large library browsing.

[abaire]

I was thinking about using a button chord to allow faster navigation in MenuXbe lists.

Specifically, if the user holds the right trigger (or whatever, could be made Config-able) and presses the dpad up/down it'll jump to the next first letter in the list.

E.g., if the user is on a title "M..." and presses down while holding the right trigger, it'd go to the first title starting with "N" if one exists, otherwise "O"...

I don't know if there are XBE titles with non-latin based characters, but maybe (case insensitive) ASCII comparison would be sufficient given that natural sorting is already handled elsewhere.

[abaire]

Closed with #100