use roles for distinguishing task between OS

[KatKmiotek]

• folder structure change: setup.yml - to gather facts on os roles/windows/tasks/...yml roles/macos/tasks/...yml vars... possibly remain in root

• use host information to distinguish between darwin and windows

  roles:
  - role: windows
    when: ansible_os_family == "Windows"

• identify tasks that are OS-agnostic

out of scope:

• implementing windows specific tasks