Add preliminar Windows support for both
development and production environments.
Default profile.Data will be set to "C:\ProgramData\memos" on Windows.
Folder will be created if it does not exist, as this behavior is
expected for Windows applications.
System service installation can be achieved with third-party tools,
explained in docs/windows-service.md.
Not sure if it's worth using https://github.com/kardianos/service
to make service support built-in.
This could be a nice addition alongside #1583 (add Windows artifacts)
