NXP-15145: factor out code handling select items for usual selections and directory selections
NXP-15145: define select widget types handling aggregates
NXP-15145: handle migation of old selectOne/selectMany directory JSF components, now replaced by facelet tag handlers, and add missing features to new selectItems components + fix aggregate widget types label computation
NXP-13805: remove old deprecated suggest box
NXP-14230: rely on migration helper to fix tab actions without an absolute path
NXP-13806: remove reference to nxa4j library (removed)
NXP-15145: fix init of DirectorySelectOneListboxHandler attributes
Revert "NXP-14230: rely on migration helper to fix tab actions without an absolute path"

This reverts commit e065dfb0ee8412ac362bc682f53509a373d9d586 (still useful for templates migration)
NXP-15145: use better names for new directory aggregate widget types
NXP-15145: fix name for directory aggregate widget type...
NXP-15145: tweak default widget properties
NXP-14230: allow overriding the tabs widget content via a widget property
NXP-15145: make sure EL expressions are still resolved when using SelectItem objects in nxu:selectItems like tag
NXP-15145: make sure directory filters its values in case selected options are mapped
NXP-15145: fix copy/paste errors in separator properties management
NXP-15145: fix default widget property mapping management
NXP-15145: cleanup useless contributions, forgotten after copy/paste
NXP-15145: fix directory values filtering, because false is not really supposed to be true
NXP-15145: fix condition evaluation for directory values filtering
NXP-15145: fix retrieval of selected items from buckets in case of directory