Use the Fedora licence code rather than doing our own thing
trivial: Remove some leading and trailing space from the appdata files
Add screenshot data to the AppStream metadata
Add a trivial script to upload the screenshots
trivial: Remove upstreamed AppData files
Only use the alpha map on images that have one
Do not fail to process the application if the screenshot is missing
Do not do thumbnails for fonts
Use a 16:9 small thumbnail size