Initial Styles support:

   +TStyleFamilyValue
   +TOdfStyleType
   +Style Family support
   -TStyleStyle (duplicate of TOdfStyleStyle)
   +Methods to create styles at  TOdfDocument

Removed TDomNodeEnumerator (already present at Laz2_dom)

Functions and procedures to search elements modified to properly support recursive search.
   +TOdfDomElementList

TSpan class created. TOdfDocument and TOdfParagraph methods added to support it.

HelloWorld Example: Updated to use the new types and methods.