Summary of the new feature/enhancement

Our automation peer (TermControlAutomationPeer) should provide appropriate default values for TermControl's accessibility related information (AutomationProperties).

Our xaml elements could probably use this too. This way, we'll know what we're interacting with when traversing the UIA tree.

Edit: Here's a list to track progress for which UIElements have the proper automation properties:

• TerminalControl
• Search Control
• TSF Input Control
• Tabs
• MinMaxCloseControl

Some of this work may overlap with #2102, because we don't need proper labels for things that don't need to appear in the tree.