functions cleanup
functions cleanup

- less overloads, better compiler results

iolevel/peachpie-concept,iolevel/peachpie-concept,iolevel/peachpie,peachpiecompiler/peachpie,peachpiecompiler/peachpie,peachpiecompiler/peachpie,iolevel/peachpie,iolevel/peachpie,iolevel/peachpie-concept