protege-distribution should obtain org.eclipse.equinox.registry jar from maven central

[matthewhorridge]

At the moment org.eclipse.equinox.registry.jar is stored locally as a resource in the protege-distribution module. It should be listed as a dependency and fetched from maven central.

<dependency>
    <groupId>org.eclipse.equinox</groupId>
    <artifactId>org.eclipse.equinox.registry</artifactId>
    <version>3.5.101</version>
</dependency>