Performance optimization

The following PBDOM objects and methods have been optimized for performance:

PBDOM_ATTRIBUTE object > SetOwnerElementObject, Clone, and SetNamespace

PBDOM_DOCUMENT object > AddContent, InsertContent, and GetElementsByTagName

PBDOM_OBJECT object > GetContent, SetContent, AddContent, InsertContent, SetParentObject, GetText, GetTextNormalize, and GetTextTrim

PBDOM_ELEMENT object > HasChildElements, GetChildElements, RemoveChildElement, and RemoveChildElements