Merge pull request #724 from leo78913/dot-ui-mainwindow
Closes https://github.com/PrismLauncher/PrismLauncher/issues/594 Closes https://github.com/PrismLauncher/PrismLauncher/issues/69 Closes https://github.com/PrismLauncher/PrismLauncher/issues/473
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