Update minimum required version of CMake to 3.13
Update minimum required version of CMake to 3.13

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