Circular dependency in components build.

The `core/components-api` module depends on `examples/components-api-full-example` for testing.

The `examples/components-api-full-example` depends on `core/components-api` for implementation.

Currently, this works because the version of `examples/components-api-full-example` is wrong (0.1.0 instead of the declared verson of 0.18.0-SNAPSHOT), so it is found in the build local repository instead of being built and reused by reactor. This causes problems for new installations/builds.

In general, the modules in the `core/` directory should not depend on modules outside the core directory.