Approach for release 4 Validation rework

Current plan/approach:

1. Implement copy constructors on the model objects (Issue #156)
2. Make a new AutoRepair tracking class of some sort (#139)
3. Make a new version of GedcomValidationFinding (Issues #135, #136, #137, #154, and #155)
4. Make a mechanism for registering a callback class to get whether or not to auto-repair errors (Issue #133 - tie to Issue #154 for codes)
5. Revise existing validation classes (with a critical eye towards initialization of collections, pre-v3.0.0)
6. Other enhancements (such as Date validation)
7. Begin copying analyzers from gedantic into validators in gedcom4j