Lists improvement by creating DynamicLists

Dynamic lists and lists improvement.

StaticList and DBList doesn't provide enough features, that's why we propose to create a third List property type based on scripts.

Usage examples:

• apply some filter to a list of results fetched from the database (like rights, languages ...),
• build lists from document content,
• build lists from XWiki API,
• build lists from other sources than the database (from a web service
  call etc.)

Short Property specification:
The property re-use properties attributes like :

• Name
• Pretty Name
• Unmodifiable
• Number
  And List attributes :
• Diplay Type
• Multiple Select
• Relationnal Storage
• Size
  We added two properties :
• Script Type : StaticList (Velocity|Groovy)
• Script : TextArea

When you display this property, a renderer is called (depending on the script type) and return the standart input formatted as a ArrayList with the getListFromString() method.

• Class DynamicListMetaClass extends ListMetaClass
  this class add two properties :
  • A script type list, where you choose the renderer between Velocity and Groovy.
    In this case is it better to manually choose the renderer or to use both.
  • A script textarea input.

• Class DynamicListClass extends ListClass
  this class provide attributes accessors and extends the method getList(XWikiContext context).

Lists internationalisation

• What about adding an attribute to Lists properties (like multiselect)

Other lists types implementation

• The checkboxes and radio boxes are quite similar : checkboxes are designed for multiselect lists and radio boxes are for non-multiselect ones. The best way is to reduce lists to select and boxes, boxes depends on the multiselect value.