Extension/Theme Manager Tests

Start app with args:
-install-global-extension <path>
-install-global-theme <path>
-list-global-items
-lock-item {GUID}
-unlock-item {GUID}


Downloads
- try to quit the app or go offline

Mismatch checking
- 

- disables all old-style extensions

Safe Mode
- disables all extensions temporarily with -no-extensions
- resumes next time

Pre-Configured Items
- DOM Inspector and Default Theme should show up

Extension Operations:
- Profile Install (click link, drag to EM)
- Uninstall Profile/Global
- Enable/Disable Profile/Global

Theme Operations:
- Install
- Uninstall
- Select

EM UI Ops:
- Options
- Home Page
- About
- Move Up/Dn/Top
- Get More links

Update
- Select Single Item
- Select No Items
- Double click status bar
- timer based checking
- status icon