Eclipse GEF Update Site
GEF Update sites are related to Eclipse releases and they are not available online for all Eclipse releases we may need.
The ones here have been downloaded and unpacked from: http://download.eclipse.org/tools/gef/classic/releases/latest
There was modification required for most of the GEF*\content.jar.
This content.jar/content.xml contains a reference to the update site http://download.eclipse.org/releases/2022-03
=> This will break Oomph installations of deviating Eclipse platform versions, since it will lead to interfering or conflicting P2 repo lookups of P2 directory runs of Oomph installer.
This repos p2site content is provided via update site https://p2site.github.io/p2.GEF