NXP-12018: add required property for all select2 widgets
NXP-12018: factorize widgets
NXP-12018: only include javascript resources at render phase
NXP-12018: cosmit
NXP-12018: provide default formatter for user and documents
NXP-12018: cleaning
NXP-12018: use toString instead of cast
NXP-12018: rename minimumInputLength to minChars
NXP-12018: add container and dropdown css class properties
NXP-12018: add warning meesage for obsolete directory entries
NXP-12018: link widget view mode to select2 readonly mode
NXP-12018: add ajaxReRender feature to select2 plus pageProviderName property
NXP-12018: distinguish selection and suggestion formatter to allow better display customization
NXP-12397: change file suggestion to select2 widget + refactore cross validation