Nested annotations do not work

Nested annotations like tho following example do not work in QDOX:

@MojoParameters( { @MojoParameter( goals = "goal4a", defaultValue = "Something" ),
@MojoParameter( goals =

, defaultValue = "Else" ) } )

(now what are we trying to do with these annotations

This has to reasons:

1. ModelBuilder.buildAnnotation does not convert the annotation values correctly. A single AnnoDef is converted to Annotation, but Lists of AnnoDefs are not.

The attached patch fixes this by converting AnnoDef in Lists, too

2. The parser keeps the values is has parsed in a property ("annoValues"). However, the grammar allows recursive invocation of annoElementValue (annoElementValue -> annotationWork -> annoParens -> annoParenContents -> annoElementValue). Thus the values are not collected correctly and the resulting parse tree is broken.

The attached patch fixes this by collecting values in a new field tempValues in the current AnnoDef, thus allowing recursive invocation.