Perform general housekeeping duties on 7.0 Codebase. Remove unnecessary code (class, methods and fields) refactor, repackage, etc.

Teiid Designer code-base is basically 10 years old. Included are recent inherited code from Teiid.

We need to perform basic house-cleaning duties to make sure we don't carry forward any more code than we need to.

So:

1) Remove unnecessary code
2) Repackage code into plugins and packages that make sense
3) Clarify "internal" code in our packaging scheme