JBIDE-18903 Refactor implementations of ITagLibRecognizer

Second contribution to refactoring. Interface methods changed
boolean ITagLibRecognizer.isUsed(ELContext context);
boolean ITagLibRecognizer.isUsed(IFile file);
IHTMLLibraryVersion ITagLibVersionRecognizer.getVersion(ELContext context);
Interface ITagLibVersionRecognizer is implemented by HTMLRecognizer
and IonicRecognizer.
This javadoc doesn't describe what this method does.