Rewrite property introspection part of framework to combine getter/setter/field annotations

Current design of BasicClassIntrospector and related parts (AnnotatedClass, BasicBeanDescription) is showing its age, and does not allow simple or correct handling of many of relationships (like implicit coupling between fields and methods with same logical property name). Explicit handling on top of current framework is both clumsy and inefficient.

This functionality should be rewritten to allow properly handling logical properties as a unit, instead of separating accessors (fields, getters, setters) completely.

As a side benefit we can greatly simplify JAXB annotation handling, as it requires similar handling to work.