Port away from KImageIO.
Summary: Same solution (for finding the format string for QImage from the mimetype) as the one used by Spectacle. Test Plan: Saving still works as PNG, JPG (to test multiple extensions), and WEBP (to test a 4-letter extension). Reviewers: broulik, andreagenor, tcanabrava, vkrause Reviewed By: vkrause Differential Revision: https://phabricator.kde.org/D25600
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