isAdminOn no longer makes sense with a JS app style admin

[scottwalters]

ack says there are 63 references to isAdminOn still floating around. At a glance, it's things like showing the clipboard and the trash and reducing cache timeouts. Except reducing cache timeouts, all or most of those other things should be replaced with webservice endpoints. The admin should handle viewing and emptying the trash and stuff like that. I'm sure these are things that Doug would have moved to the admin if he'd gotten to them.

The admin should turn admin mode on the site on and off when it launches and is closed. 7fbf151 added an API endpoint to let it do that. That is still useful for disabling (or nearly disabling) caching and similar things.

Other things like trash need APIs written for them.

From WebGUI::Asset::Redirect displays decision page even when admin mode is turned off #49

[scottwalters]

Oops, was trying to salvage bits of the other ticket before closing it, but that was the major part of it. Redundant.