Hide/Show AR Pages

[blairmacintyre]

Right now, if the front page is non-AR, it is shown. And if the front page is AR, all AR pages are shown.

It would be VERY useful in the application to be able to do one or more of the following:

• hide an individual AR page. Let's say I want to have an app loaded and running, but don't want to see it right now. I'd like to "hide" it. Perhaps this is done in the channel view, and we get a visual feedback of which are hidden (ghosted out? Different header line?). If you select a hidden channel, it comes to the front and becomes unhidden
• switch between "show all AR pages" and "show only one AR page" mode. Could be a toggle in the menu ("show all AR apps" "show only one AR apps")?

This implies, perhaps, that a new event could be sent to an argon app to tell them if they are visible or hidden. And perhaps when hidden they only get the update Events, not render Events.