fix(ngMobile): prevent ngClick when item disabled

 - the ngClick attribute was always triggered, regardless the ngDisabled/disabled attributes
 - we now check the ngDisabled status before triggering the original click event
 - and also check the DOM disabled attribute to be homogenous with the regular HTML disabled behavior (disable presence makes the element and click disabled)
 - deals with #3124 #3132 /cc @shepheb