Revision 165225

o Cleaned up field-level annotation support (especially descriptor extraction, generation, and building)
o Converted all "core" plugins (including maven-core-it-plugin) to use field-level annotations
o Removed generation of parameter descriptors for ${/#component.* param specifications.
o Added @readonly for parameters that cannot be overridden by user configuration (List override was dangerous here)
o Added validation against pom-derived configuration for @readonly parameters
o Fixed @parameter alias="" support...now configuration of the mojo instance actually will work with either the real param name or the alias. Would be nice to support multiple aliases, but that might require @alias annotations...
o Added [temporary?] support for null editable attributes for parameters, to support pre-built mojos from the repo.

Annotation support should be just about ready to go...