Implemented support for compiling html and innerHTML bindings in the htmlt compiler.
Added support for @attribute bindings in the htmlt compiler, switched root node CSS classes over to using the mBindings_rootNodeClasses binding to the class attribute, and restructured code to be more efficient and robust (no more iterating over attributes to find id and class attributes, while potentially adding new attributes in the bindings handling code and still in the attributes loop).
TODO doc tweaks.