Add ability to protect shows.

Quick and dirty, add capability to write protect or password protect certain shows.

Reason:
We have a set of ‘template’ shows that our techs use as a starting point for each Sunday (3 techs, one for each service). The tech for the first rehearsal of a week recalls the template and once down with rehearsal saves a new show for Sunday’s service. The tech for the next band’s rehearsal adds a new scene to the show.

It does not take much to have the wrong show selected when hitting the overwrite button. Yes there is a warning, but with all the work we do to create the shows, I’d much rather have a password or write protect capability.