Periodically check for and handle pending GTK events while performing long operations. #625
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Please note: I really don't know much about GTK (especially with Rust) so this may or may not be the correct approach.
This change checks for and handles a pending GTK event once every 100 files processed. It may make sense to handle all pending events. The frequency of event checking could obviously be changed quote easily, I don't know what the optimal value is but 100 seemed reasonable.
Closes #624