refactor services

[gossi]

Services which are generated in AbstractGenerateCommand and are injected into e.g. generators are a bit weird. For one they are not even services (except maybe IOService), they are more like collections of helper methods that are used throughout generators and commands. They are also unluckily splitted into various service classes. Also some of these helper methods are already ancient and can be easily removed rsp. replaced by more appropriate methods.

Whatever feels good in this situation, this is clumsy.