EXP-1232 FIX -- Create class to load and hold all of the command meta data associated with FUI toolbar actions
* Added basic commands.xml file to define FUI-related toolbar actions. For now
a basic "avatar" and "places" button are defined.
* Added basic command manager to parse and hold strings that define potential
toolbar command actions.
* Broke out a separate floater function as a placeholder for the 3-state toolbar
floater toggling.
* LLUI::initClass now parses the new commands.xml file
Reviewed by Richard.
Leslie Linden