Add progress dialog when exporting an instance

[Apocalypsing]

Role

Exporting instances for use with Prism Launcher on other systems

Suggestion

When exporting an instance, Prism Launcher should display a progress dialog. Currently the entire launcher stops responding while it compresses the instance in the background

Benefit

This would help a lot when exporting larger instances, especially since data compression is CPU-intensive in nature and may take a while to complete

This suggestion is unique

• I have searched the issue tracker and did not find an issue describing my suggestion, especially not one that has been rejected.

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