Allow configuration of AnnotationClass fields wrt. their visibility in various actions/modes.

Currently, a hardcoded list of AnnotationClass fields exists that specifies which fields to ignore from view/edit/create/list modes. Also, for filter mode, only the author is hardcoded to be displayed.

The proposed patch defines an AnnotationHiddenPropertyClass and expects that the custom/default AnnotationClass XWiki document contains such objects which specify what properties to hide from the current modes in which an annotation can be interracted with: view, edit, create, list, filter.

The AnnotationCode.Settings page has been modified to use all such annotation properties/fileds for filtering and the AnnotationCode.Macros has been modified to use such properties in the remaining modes.

This way, anyone that implements a custom AnnotationClass and an IOService can display and manipulate all the defined properties, without having to override existing macros that directly handle the annotations.