qtd3dservice: Add triggers for Windows Phone devices and emulators

qtd3dservice: Add triggers for Windows Phone devices and emulators

This adds event triggers which allow for detecting when a device or
emulator is activated. When a device comes online, it is checked for
applications, and workers are created to monitor each application.

This changes the behavior for device connections. Instead of retrying the
connection repeatedly for 30 seconds, the worker returns after the first
failure. This is acceptable, because the worker will automatically be
reactivated when the device comes online.

Change-Id: Idab622d85de314edd18fad8bf721cbae1c17ca75
Reviewed-by: Oliver Wolff <oliver.wolff@digia.com>