* QEMU generic memory iterator + Refactoring
* Generic Memory Iterator (systemmode only for now): It is now possible to iterator over memory ranges, independently of the address kind
* Refactoring or Emulator / Qemu structures: they are now handled separately in different files
* Refactoring of Exit Handlers: Result / Error structs have been clarified
* Simple handler for signals
* add new `check-cfg` calls for libafl qemu
