ristretto: Update to 0.6.3
This update fixes the following issues for ristretto:
- update to version 0.6.3
- use thumbnail as appicon
- update the first image in the image-list when receiving a ready-signal which is required to show the thumbnail once it's generated
- update to version 0.6.2
- fix a crash when configuring the 'limit-quality' property
- translation updates
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Submitted by
Guido Berhoerster (gberh)
