new fields for apps: license, download size and resources
two fields should be added to the apps.
license: just text (for now) for contributors to put the license for the app.
download size: precise size for the download (whatever file the sha1 is for) to be made by the installer (not counting whatever that installer scripts may do) to show the user
resources: encoded like this. port:7443 port:XYZ. may need more encodings?
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