Want to be able to perform certain operations over multiple items in project panel.

• Each item in the project listing should have a checkbox (or similar UI element) to toggle selection.
• "Select All" action to check all visible items (filtering by type and keyword affects what is selected)
• "Deselect all" action -- clear all selections
• Refreshing the list or changing the filtering should keep all visible selections, if something that was selected is now hidden, it should be de-selected
• Paging forwards/backwards clears selections (because previous selections are no longer visible)
• When multiple items are selected, context/action menu actions apply to all selected items (the the label for the action should make this clear)
• Initial actions to support:
  • Move selected
  • Trash selected
  • Copy selected -- only enabled if only "copyable" items are selected (collections, Workflow objects, filter groups, but not subprojects)