global functions case insensitive in runtime
global functions case insensitive in runtime

- fixes https://github.com/peachpiecompiler/peachpie/issues/153
- lookup of global routines in runtime is case insensitive

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