Renderer doesn't handle monitor being disconnected

Possibly a missing event handler. Note this might be swap-chain related but should also hit other cases if possible, e.g. HDR display detection currently only occurs on device init.

Launch QAGame exclusive fullscreen on a single connected display.
Disconnect then reconnect the display cable.
Note screen is black.
Alt-tab out and back into game.
Note screen is restored.
Screen should restore upon re-connection.

EDIT: Also reported with multiple displays.

See UDN for more details: https://udn.unrealengine.com/questions/351564/fullscreen-game-window-goes-black-when-losing-the.html

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