Support Eclipse 4.12 core runtime 3.15

[fvgh]

The Eclipse team finally replaced the usage of deprecated PackageAdmin by org.osgi.framework.wiring.FrameworkWiring.
Hence spotless-eclipse-base must also replace/add a corresponding service since it currently provides (only) PackageAdmin.

Proposal
Provision of a new spotless-eclipse-base version supporting additionally org.osgi.framework.wiring.FrameworkWiring implementation by the existing EclipseBundleLookup.
Note that there are some more things to do, since the new InternalPlatform version requires to be started whereas superfluous activities like Eclipse authorization handling must be prevented.

Work-around
If new Eclipse versions shall be supported beforehand, try to pin the org.eclipse.platform:org.eclipse.core.runtime version to 3.14.0 and org.eclipse.platform:org.eclipse.core.resources to 3.13.0.

[fvgh]

If anybody else wants this task, I am happy to assist.

[nedtwigg]

FWIW, I just updated goomph for 2019-06.