Renumber cues

I would love to be able to renumber all the cues in the show to whole numbers. The cue list would then be much easier for the caller and generally look good.

The workaround of moving cues to some other number is just too tedious a task.  Especially when the cue numbers go into hundreds, and with in-between point cues.

QLab, grandMA, Chamsys, Hog all allow for the cues to be renumbered