Unlock slides when they are not being actively edited

When prepping for a presentation where multiple people are collaborating, we are constantly running into the issue of people locking slides unintentionally simply by viewing the slide deck or forgetting to close their tabs. As a result we have to spend time chasing these people down and asking them to leave the slide so we can edit it again.

Please consider the following changes:

• Only lock a slide if a user actively clicks/selects an element on that slide

• If a user has not made any changes in the past X minutes (5?) release the slide to be edited by someone else