Move typedefs to private.
Move typedefs to private.

fmilano/mitk,MITK/MITK,fmilano/mitk,fmilano/mitk,fmilano/mitk,fmilano/mitk,MITK/MITK,fmilano/mitk,fmilano/mitk,MITK/MITK,MITK/MITK,MITK/MITK,MITK/MITK