Prevent UI errors while the the import thread is running

While the import thread is running it is possible to:
1) click the [x] button of the "download dialog".
To prevent that, we attach a "delete-event" signal to no-op function.

2) to interact with the main window, once the "accept" event is triggered.
To prevent that, we make sure that the window is set back to "modal".

Signed-off-by: Lubomir I. Ivanov <neolit123@gmail.com>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

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