metainfo: Modernize and add brand colors
- Change from deprecated
<developer_name>
tag to the new<developer>
- Add brand colors for display in e.g. Flathub banners
- Remove "GNOME" and "GTK" from categories as those are not recommended to be used there. Add them to keywords instead
- Remove keywords from appstream file as they are inserted from the desktop file
- Add
<requires>
tag, which is the modern way to specify device requirements alongside the controls in<support>
- Remove Purism's custom tags, as they're deprecated now
- Indicate that the app doesn't need internet to run with
<internet>
tag - Move stuff that was below
<releases>
above, since the release list gets a little long after a while
This MR makes GNOME Software correctly label Chess Clock as mobile compatible:
Brand color preview: