Remove obsolete dependencies

These projects are no longer managed in the latest pom-fiji, having
been obsoleted (mostly by various things migrating into ImageJ2).
POM: tweak repositories comment
POM: bump to pom-fiji 5.0.2

This updates to the latest SciJava software components.

It also uses release versions for all Fiji components.
POM: add artifacts migrated from fiji-compat

These are "artifacts which we would like included with Fiji
regardless of whether any Fiji plugin depends on them directly."