[Feature Request] Delete/Backspace Increment by Note Steps

[dotmatrixgirl]

Feature: Cursor moving forward by the set note steps after pressing delete, same as when inputing a note. (This was particularly inconvenient while deleting the notes in a channel...) A similar behavior change for backspace would be nice as well. Based on how other trackers implement it, here's what I like the best: When note step is any value besides "0", backspace deletes the prior row and moves back a row. When note step is set to "0", pressing backspace only deletes the current line and doesn't move back a row. (same thing when the current row is 0)