ZF-11225: Make escaping label optional in FormErrors form decorator


it will be really nice to have this property available to set in decorators in form

something like it is in element decorators, where i can have array('Label', array('tag' => 'th', 'escape' => false)),

and it will be look somehow like here array('formErrors', array('placement' => 'PREPEND','escape' => false))

now its in Zend_Form_Decorator_FormErrors on line 422 set hardcoded, thanks


Patch and unit tests added.

Fixed in trunk (1.12.0): r24869