could installation of Teiid Designer be made simpler via p2 metadata <references> to upstream sites?

Current instructions for installing Teiid Designer 8.2 [1] involve multiple steps, installs, and restarts of Eclipse. This is more complex than it needs to be.

[1] https://www.jboss.org/teiiddesigner/downloads

Instead, the Teiid Designer update site could simply reference the upstream URLs that it needs to perform the installation, and as long as all of Teiid Designer's features & plugins properly define dependencies on the required upstream features and plugins on these update sites, installation should be able to proceed from a single URL, rather than a handful. It would allow installation via a single step, rather than several iterative steps.

I'll attach a PR to demonstrate this.