LPS-35401 Fix source formatting

We have to use the full package name because the IconHelpTag already imported is not the class that we want to use.
LPS-35401 iconHelp and iconHelp(String) shouldn't give 2 different results, because that's not immediately obvious. Overriding methods usually changes behaviors of the same method, not different methods. Rename icon* to portletIcon*, and keep iconHelp(String) as the method to match "icon" from the "liferay-ui" namespace
LPS-35401 Update old references
LPS-35401 Nate, back in the day, liked the name "theme" vs "taglibLiferay", but both reference the same VelocityTaglib obj