Modified testing code (desired functionality).
Support for smart adding of NameAndType item to the constant pool.
Adding support for @ffref (fake/fast field reference).
Refactoring (move @ffref to the new package).
Refactoring: extract superclass (@ffref no longer contains
implementation, it uses methods of a parent class AnnotationFastRef).
Added support for @fmref.
Added support for @fimref.
Refactoring: renaming AnnotationFFref to AnnotationFFRef (fixing a
typo).