[horde] Form & Variable Classes - Hidden Variables

[Mike Bydalek]

This is starting to wear on me, but I think I'm making progress.  One of 
the things I noticed that I just wanted to toss out to see what your 
thought process was, is regarding the Form Renderer.  The thing that 
strikes me as odd is that there is not <input type="hidden" ...> if you 
do an addHidden(), because there is no Horde_Form_Type_hidden, just like 
there is for _text, _enum etc.  To be consistent and make life easy, 
shouldn't there be a Horde_Form_Type_hidden?  Then all the references to 
the checks for $this->_hiddenVariables can be eliminated.

To me, there is already a great layout for variable types, so adding 
this shouldn't be too difficult at all.  Additionally, if one wants to 
the renderer as it is now, there's no way to pass hidden variables to 
another form since the browser isn't processing them at all.

Thoughts?

-Mike