rv 02.  Add suport for set/get Attributes

rv 02.  Add suport for read/write Attributes + minor fixes
NEW Add suport for read/write Attributes
NEW function GetAttrList(query: string): string;
NEW function GetAttrValueByName(query: string; attrName: string)
NEW procedure SetAttribute(query: string)
NEW Add    AppDemo3

revision 02 - minor fix for GetDOMNodeReference