support filter class with parse/write in code generator
support filter class with parse/write in code generator

vinod1988/npoi,stuartwmurray/npoi,JesseQin/npoi,tonyqus/npoi,Yijtx/npoi,antony-liu/npoi,xl1/npoi,akrisiun/npoi,jcridev/npoi,tkalubi/npoi-1