feat: Don't auto-dismiss the playback toolbar when the cursor is over it, also make it possible to click anywhere to progress

[matthew-carroll]

I'm doing run throughs of a presentation. I place the cursor over the "next" button to click through some slides. But when I take more than a few seconds on a given slide, the control bar disappears, even while the cursor remains of the "next" button.

The reason that I'm trying to leave the cursor over the next button is because I'm used to clicking anywhere to move forward. I was hoping that I could leave the cursor on the "next" button to still accomplish that. But it disappears.

Along those lines, I'd like the ability to enable a "click anywhere to move forward" mode. I'm guessing that this can be implemented by disabling standard controls and then adding appropriate gesture detectors to all slides. But that's a very significant modification to gain a standard slideshow control mechanism.