P2: show when app is paused from pages other than the debugger page

[devoncarew]

We should show when the app is paused from pages other than the debugger page.

One option for this is to:

• move the 'device info' status line item from the lower right portion of the DevTools' UI to an icon item in the upper right of the screen
• add a run state / app status item to the right hand side of the status line ('running' / 'paused' / 'paused at an exception'), and include some simple controls to resume the app if paused
• include a badge on the 'Debugger' tab to indicate when the app is paused (a (P) badge icon, or, a breakpoint icon)